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"De quem é o olhar
Que espreita por meus olhos?
Quando penso que vejo,
Quem continua vendo
Enquanto estou pensando?
Por que caminhos seguem,
Não os meus tristes passos,
Mas a realidade
De eu ter passos comigo?
(...)"
Fernando Pessoa
___________________________________________________________________
“Di chi è lo sguardo
Che spia per i miei occhi?
Quando penso che vedo,
Chi continua vedendo
Mentre sto pensando?
Per cui cammini seguono,
Non i miei tristi passi,
Ma la realtà
Di io avere i passi con me?
(...)”
Fernando Pessoa
Complexity driven collapse of economic equilibria. Bardoscia, Livan, Marsili arxiv.org/abs/1511.09203 #q-fin
Our floral bounty is a never ending inspiration to me. I get drawn deeper and deeper into the textures and details daily.
meta_creation lab: inter-actors, attractors and the aesthetics of complexity
Marlon Barrios Solano
www.dance-tech.net/page/meta-creation
A collaborative workshop interfacing movement art practices, digital creativity, portable computation and networked systems.
This workshop is a collaborative lab to creatively explore the contemporary approaches, practices and aesthetics of self organization and of complex systems within the dynamic couplings of mind, body and information/data flows.
This workshop is an open space for experimentation and inquiry within a well defined theoretical/aesthetic frame and open space format: the participants self-organize in different node projects (collaborative and flexible groups) in order to investigate and deploy bottom-up architectures as compositional prototyping strategies and processes. It explores interactivity plus generativity.
An embodied/distributed cognition approach is used to generate physical activities and games, guided discussions/conversations about relevant artists works and concepts exploring the aesthetic of complex systems and emergence.
Open source technologies and methodologies will be explored in combination with composition in real-time.
Inter and trans-disciplinary explorations are encouraged and diversity is the main asset.
Several nodes of research projects are suggested:
Sampling, recombinations and mashups
New Internet technologies (web 2.0) and collaborative creation
Post-pc technologies apps, tablets and mobile technologies
Life logging and creative process
Media Capturing and Real time processing
Bottom-up architectures of generative systems
Hybrid realities and alternative sites
Portable cameras and video production
Online video and video straming
Cloud/social computing
Locative media/Mobile
Performance, rule systems and algorithms.
Computer aided choreography
Portable hardware as interfaces/interactive media control
Social media for distributed creativity and knowledge production
Networked documentaries/storytelling.
Photos from workshops in Beirut, October 2011
Entered "Complexity" challenge of photofriday.
taken by shorty.
These images are latest 200 images of our photoblogs (W2 a-w-f-i-l). Please visit our blog!
this is a tiny detail (but still impressive in size) of the internal structure of the LZ129 hindenburg, the zeppelin that ended the zeppelin era. seeing the sheer number of parts in this construction is mindboggling: each of the triangular beams is constructed of probably hundreds of aluminum parts bolted together, and there are thousands of those beams. the ropes were used to separate the gas bags (not part of the reconstruction) from the outer shell, so that the trapped air would serve as insulation, and also make sure that a minor accident involving the outer shell would not compromise the gas bags. ultimately, the zeppelin era did not last very long, but seeing how far they got (LZ130, the biggest one, was 244m/803ft in length) is pretty amazing.
Zooms of the Mandelbrot set around a point projected so that the distance to the point forms a logarithmic scale. Details on the left edge are ~10^15 times smaller than on the right edge.
The rightmost black blob in the pictures is the main "continent" of the set. Satelite sets of different sizes can be seen linked by fractal chains of varying complexity.
The colors are set using the distance estimator method.
For twenty-five years London has been subject to a beautiful onslaught of criminal activity, reprehensible to some, embraced by others, colourful, witty and provocative. Street art, phenomenon of the 1990s, developed from graffiti art, a phenomenon of 1980s, is a regular occurrence on London's streets; in some areas it is ubiquitous. Its existence in London owes much to the city's cultural ties with New York, London's wealth and status and to the talent and determination of Bristol based artist Banksy, who introduced street art to London.
In London there are hives, around which street artists buzz, fanatics hunt and serendipitous locals and tourists register pieces on their mobile phones. These hives are to be found in Camden, East London and Leake Street in Waterloo. The Camden part of Regent's Canal, in 2009, hosted London's first and only street art battle between street-artist par excellence Banksy and an old time graffiti artist Robbo. In Shoreditch, East London, gallery owners, design studios and businesses, inspired by early works of Banksy, commission art on the outside of their buildings. This commissioned work is accompanied by an ever changing pastiche of gratuitous work, which has turned Shoreditch and East London into the spiritual home of street art. Leake Street, a disused railway tunnel just behind Waterloo Train Station became a hive for street artists and graffiti artists after Banksy organised a street art festival there in Spring 2008, which led to the tunnel being designated a legal space for street art and graffiti.
The Chinese say life is both yin and yang and the same can be said for the energies and motivations driving street art. Yin is an explosion of energy, an attempt to mean something to someone, a fire fuelled by a need for recognition and acceptance. Yang is a deep breath out, a chance to reflect, an opportunity to disconnect and feel one's real emotions; to disengage from the zeitgeist. For some, street art is all about the yang about free expression, emotion, creativity and the altruism of the street artist. It is part of an idealistic utopian philosophy that art should be for the people, free and accessible. However, in reality, most artists are guided by yin, fuelled by a desire to make it as an artist, to get a name, to get ahead.
All street artists experience the tension between yin and yang, it causes many to entertain delusions about the greater good of what they are doing, to hide their problematic egoistic tendencies and criminal activity. The fact is, the street artist is a psychopathic charmer, trying to seduce you with the beauty, audacity and complexity of his gift, hoping you forget he has, unilaterally, decided that his need for his art on your wall, is greater than your right to enjoy your wall, as it is, without interference. And London's heart is fluttering. The media celebrate street art, local authorities protect street art works from vandalism; the firm Pearl and Coutts, when it found out that Westminster Council wanted to remove a Banksy exhibit from one of its walls, went to the length of taking Westminster Council to court, to try, unsuccessfully, to have the image protected. In 2008, London art auctioneer Bonhams held London's first auction of street art, ; Village Undeground held an "urban art sale" and a piece by Banksy attracted a bid of £208,100. The elevated status of the street artist prompts invitations for shows from owners hoping to cash in on the cache. Like this the street artist is laundered.
The rise of the internet, which has coincided with the rise of street art, has created a virtual street art world. In the real world of street art those who happen to see the art, and enjoy it, encounter it as a moment of serendipity. Bloggers and web site owners rip the art from their geographical location and juxtapose the images next to each other. Here, viewers of street art get a concentrated experience, delivered to them through the click of a mouse, rather than the motion of their legs. Street art in the real world is transient, in the virtual world, digitally preserved, it lasts forever. The magic that might have been shared by a few, who had the luck to walk down a street at a particular point in time, can now be shared by millions in the virtual world. What we are left to ponder is whether street artists are creating street art, with a view to how this will be seen in the virtual world first, with considerations for people who and experience it in the street, coming second?
A CALL TO ACTION TO BUILD BELOVED COMMUNITY
SOUTHERNERS ON NEW GROUND & ALTERNATE ROOTS
CHARLESTON MARKET HALL
Charleston, SC
MONDAY, JANUARY 21, 2013
Today, as we commemorate freedom fighter Dr. Martin Luther King Jr., and as President Barack Obama is inaugurated for his second term, we gather on contested ground to promote Dr. King’s vision of Beloved Community. We gather because the current symbolism of Charleston is rooted in its history as a pro-slavery Port City and it does not reflect our histories, our struggles, or our resistances. We gather because the face of Charleston should show the diversity and complexity of our lives and histories. We do not glorify the bloodshed, violence and horror of chattel slavery that built this city. We recognize this history as people of color, and as lesbian, gay, bisexual, transgender, and queer people, and we know that we have a shared stake in transforming this city. We gather today because, in this time of great peril and great possibility, we believe in redemption!
We call on all Southern people to build King’s vision of Beloved Community! We must undergo a transformation of our collective values in order to end what King called “the giant triplets of racism, materialism, and militarism”. We need a revolution of our values that spans in scale from the conversations we have with our kids over breakfast to the way whole communities relate internationally. To do this, we must weave a strong new social fabric between us. We call on our communities, locally, nationally, and globally, to step boldly over the lines of race, gender, class, religion, and sexuality that isolate us from one another. We call on you, our sisters and brothers in struggle, to meet each other as neighbors and friends, to collaborate to make King’s dream of Beloved Community come true.
We dream, too. We dream of an end to racism, an end to poverty, an end to military terror. We dream of queer liberation, of community gardens that grow where prisons and detention centers have closed. We dream of safety for all children, we dream of a place where every person is able to achieve their full humanity. We know that these dreams are not impossible or idealistic, but absolutely necessary if we are all to survive and thrive. In the word’s of Fannie Lou Hamer, “Nobody’s free ‘til everybody’s free!”
It is with increasing urgency that we gather today to make visible our renewed commitment to Southern Freedom Movement, the same movement that swept the South in the 60’s and broke the back of Jim Crow. On this day, hundreds of other organizations and communities are gathering in their home towns, sharing their dreams for their lives and the lives of their children. We stand in solidarity with people all over the South who are organizing to solve problems in their communities, who are resisting poverty, resisting racism, resisting obliteration of our lives and our cultures. We will not be erased! We are your neighbors, your family members and friends; we are your teachers, your grandmothers, we are people of faith; and we are queers, we are sex workers, we are youth in the streets, we are undocumented and unafraid! We will leave no one in our Beloved Communities behind!
We stand in solidarity with People’s First 100 Days Actions today in Jacksonville, FL; San Antonio, TX; Atlanta, GA; Durham and Greensboro, NC; Dothan, AL; Knoxville, TN; Houston, TX; Asheville, NC; Tunica, MS Little Rock, AR; and all other cities and towns where Southern Freedom Movement is rising to the call of a new day. And, because we know that Southern people are not alone in this struggle, we stand in solidarity with oppressed people everywhere. In a time of charismatic leaders, we decide instead to look to ourselves, because we are the leaders we have been waiting for. Together, we will rise and transform the South’s legacy of division, fear and hate into a New South, a Beloved Community that we can ALL be proud of. In the words of Dr. King, “We shall overcome, because the arc of the moral universe is long, but it bends toward justice."
photo by Savannah Brennan
This photograph looks a simple and ordinary photograph of urban landscape. It shows near traffic lights in front of a distant office building (at the end of Jaffa Street) but it has two layers which add to it complexity: the background is black and white while the traffic lights and the sign have color; The background is made of squares in different sizes, while the traffic lights and the sign above them are round.
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Traffic Light & Windows
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פשטות ומורכבות
=
הצילום הזה נראה צילום פשוט ושגרתי של נוף עירוני: אורות רמזור קרוב על רקע חזית מרוחקת של בניין משרדים, אבל יש בו שני רבדים שמוסיפים לו מורכבות: הרקע שחור לבן בעוד הרמזור והשלט שמעליו בצבע; הרקע עשוי מריבועים, בעוד הרמזור מלבני והפנסים והשלט שמעל לרמזור עגולים
I believe this is a photo taken just outside of - well - I just noted my location on the side there, to Midlothian, TX USA! :) I used to travel out this way for sunrises from DFW. :)
The small, specialized parts seem to lend themselves to scripted designs rather than plastic play. Maybe this helps LEGO sell more sets…
A CALL TO ACTION TO BUILD BELOVED COMMUNITY
SOUTHERNERS ON NEW GROUND & ALTERNATE ROOTS
CHARLESTON MARKET HALL
Charleston, SC
MONDAY, JANUARY 21, 2013
Today, as we commemorate freedom fighter Dr. Martin Luther King Jr., and as President Barack Obama is inaugurated for his second term, we gather on contested ground to promote Dr. King’s vision of Beloved Community. We gather because the current symbolism of Charleston is rooted in its history as a pro-slavery Port City and it does not reflect our histories, our struggles, or our resistances. We gather because the face of Charleston should show the diversity and complexity of our lives and histories. We do not glorify the bloodshed, violence and horror of chattel slavery that built this city. We recognize this history as people of color, and as lesbian, gay, bisexual, transgender, and queer people, and we know that we have a shared stake in transforming this city. We gather today because, in this time of great peril and great possibility, we believe in redemption!
We call on all Southern people to build King’s vision of Beloved Community! We must undergo a transformation of our collective values in order to end what King called “the giant triplets of racism, materialism, and militarism”. We need a revolution of our values that spans in scale from the conversations we have with our kids over breakfast to the way whole communities relate internationally. To do this, we must weave a strong new social fabric between us. We call on our communities, locally, nationally, and globally, to step boldly over the lines of race, gender, class, religion, and sexuality that isolate us from one another. We call on you, our sisters and brothers in struggle, to meet each other as neighbors and friends, to collaborate to make King’s dream of Beloved Community come true.
We dream, too. We dream of an end to racism, an end to poverty, an end to military terror. We dream of queer liberation, of community gardens that grow where prisons and detention centers have closed. We dream of safety for all children, we dream of a place where every person is able to achieve their full humanity. We know that these dreams are not impossible or idealistic, but absolutely necessary if we are all to survive and thrive. In the word’s of Fannie Lou Hamer, “Nobody’s free ‘til everybody’s free!”
It is with increasing urgency that we gather today to make visible our renewed commitment to Southern Freedom Movement, the same movement that swept the South in the 60’s and broke the back of Jim Crow. On this day, hundreds of other organizations and communities are gathering in their home towns, sharing their dreams for their lives and the lives of their children. We stand in solidarity with people all over the South who are organizing to solve problems in their communities, who are resisting poverty, resisting racism, resisting obliteration of our lives and our cultures. We will not be erased! We are your neighbors, your family members and friends; we are your teachers, your grandmothers, we are people of faith; and we are queers, we are sex workers, we are youth in the streets, we are undocumented and unafraid! We will leave no one in our Beloved Communities behind!
We stand in solidarity with People’s First 100 Days Actions today in Jacksonville, FL; San Antonio, TX; Atlanta, GA; Durham and Greensboro, NC; Dothan, AL; Knoxville, TN; Houston, TX; Asheville, NC; Tunica, MS Little Rock, AR; and all other cities and towns where Southern Freedom Movement is rising to the call of a new day. And, because we know that Southern people are not alone in this struggle, we stand in solidarity with oppressed people everywhere. In a time of charismatic leaders, we decide instead to look to ourselves, because we are the leaders we have been waiting for. Together, we will rise and transform the South’s legacy of division, fear and hate into a New South, a Beloved Community that we can ALL be proud of. In the words of Dr. King, “We shall overcome, because the arc of the moral universe is long, but it bends toward justice."
photo by Savannah Brennan
meta_creation lab: inter-actors, attractors and the aesthetics of complexity
marlon barrios solano
www.dance-tech.net/page/meta-creation
A collaborative workshop interfacing movement art practices, digital creativity, portable computation and networked systems.
This workshop is a collaborative lab to creatively explore the contemporary approaches, practices and aesthetics of self organization and of complex systems within the dynamic couplings of mind, body and information/data flows.
This workshop is an open space for experimentation and inquiry within a well defined theoretical/aesthetic frame and open space format: the participants self-organize in different node projects (collaborative and flexible groups) in order to investigate and deploy bottom-up architectures as compositional prototyping strategies and processes. It explores interactivity plus generativity.
An embodied/distributed cognition approach is used to generate physical activities and games, guided discussions/conversations about relevant artists works and concepts exploring the aesthetic of complex systems and emergence.
Open source technologies and methodologies will be explored in combination with composition in real-time.
Inter and trans-disciplinary explorations are encouraged and diversity is the main asset.
Several nodes of research projects are suggested:
Sampling, recombinations and mashups
New Internet technologies (web 2.0) and collaborative creation
Post-pc technologies apps, tablets and mobile technologies
Life logging and creative process
Media Capturing and Real time processing
Bottom-up architectures of generative systems
Hybrid realities and alternative sites
Portable cameras and video production
Online video and video straming
Cloud/social computing
Locative media/Mobile
Performance, rule systems and algorithms.
Computer aided choreography
Portable hardware as interfaces/interactive media control
Social media for distributed creativity and knowledge production
Networked documentaries/storytelling.
Photos from workshops in Beirut, Lebanon.
October 2011
Plot of 1 second of human brain (EEG) activity.
Made in VVVV. Some of this works are part of a project called Sounds Of Complexity. www.kinotek.org/soundsofcomplexity.html
Melanie Mitchell, Complexity: A Guided Tour.
www.amazon.com/Complexity-Guided-Tour-Melanie-Mitchell/dp...
14.5'' diameter fully beaded sphere. Glass seed beads hand sewn to a wool felt stuffed ball. Approx. 660 hrs. to complete
A close up of the Chihuly 'Fireworks of Glass' exhibit at the Indianapolis Children's Museum.
--Submitted to 'Masters of Photography' for their February contest, 'Primary Colors.'
--Submitted to Internet Photo Taking Competition for their theme, 'Complexity.'
--Submitted to Photo Friday - 'Elaborate'
The castle has been the seat of the Percy family since Norman times. By 1138 the original motte and bailey castle, with wooden buildings, was replaced with stone buildings and walls. In 1309 the keep and defences were made even stronger by Henry de Percy. The castle then stayed unchanged for 400 years. By the 18th century it had fallen into ruins. The keep however was then turned into a gothic style mansion by Robert Adam. In the 19th century the Duke of Northumberland carried out more restoration of the castle.
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ALNWICK CASTLE, THE CASTLE, STABLE COURT AND COVERED RIDING SCHOOL INCLUDING WEST WALL OF RIDING SCHOOL
Heritage Category: Listed Building
Grade: I
List Entry Number: 1371308
National Grid Reference: NU 18685 13574
Details
This list entry was subject to a Minor Amendment on 05/10/2011
NU 1813 NE 2/1 NU 1813 SE 1/1 20.2.52. 5330
Alnwick Castle The Castle, Stable Court and Covered Riding School including West Wall of Riding School
GV I
Alnwick Castle has work of every period on the line of the original motte and bailey plan. By 1138 a strong stone built border castle with a shell keep in place of the motte, formed the nucleus of the present castle with 2 baileys enclosing about 7 acres. The curtain walls and their square towers rest on early foundations and the inner gatehouse has round-headed arches with heavy chevron decoration. The Castle was greatly fortified after its purchase by Henry de Percy 1309 - the Barbican and Gatehouse, the semi-circular towers of the shell keep, the octagonal towers of the inner gateway and the strong towers of the curtain wall date from the early to mid C14. Ruinous by the C18, the 1st Duke had it rehabilitated and extended by James Prince and Robert Adam, the latter being mainly concerned with the interior decoration, very little of which remains except for fireplaces in the Housekeeper's and the Steward's Rooms and for inside the present Estates Office range. Capability Brown landscaped the grounds, filling in the former moat (formed by Bow Burn). The 4th Duke employed Anthony Salvin 1854-65 at the cost of £1/4 million to remove Adam's fanciful Gothic decoration, to restore a serious Gothic air to the exterior and to redesign the state rooms in an imposing grand Italian manner. The Castle is approached from Bailliff gate through the crenellated Barbican and Gatehouse (early C14): lion rampant (replica) over archway, projecting square side towers with corbelled upper parts, fortified passage over dry moat to vaulted gateway flanked by polygonal towers. Stone figures on crenellations here, on Aveners Tower, on Record Tower and on Inner Gateway were carved circa 1750-70 by Johnson of Stamfordham and probably reflect an earlier similar arrangement. In the Outer Bailey to the, north are the West Garrett (partly Norman), the Abbott's Tower (circa 1350) with a rib vaulted basement, and the Falconer's Tower (1856). To the south are the Aveners Tower [C18], the Clock Tower leading into the Stable Yard, the C18 office block, the Auditor's Tower (early Clk) and the Middle Gateway (circa 1309-15) leading to the Middle Bailey. The most prominent feature of the Castle on the west side is the very large Prudhoe Tower by Salvin and the polygonal apse of the chapel near to it. In the Middle Bailey, to the south are the Warders Tower (1856) with the lion gateway leading by a bridge to the grand stairs into the walled garden, the East Garrett and the Record Tower (C14, rebuilt 1885). In the curtain wall to the north are 2 blocked windows probably from an early C17 building now destroyed and the 'Bloody Gap', a piece of later walling possibly replacing a lost truer; next a small C14 watch tower (Hotspur's Seat); next the Constable's Tower, early C14 and unaltered with a gabled staircase turret; close by is the Postern Tower, early C14, also unaltered.'To the north-west of the Postern Tower is a large terrace made in the C18, rebuilt 1864-65, with some old cannon on it. The Keep is entered from the Octagon Towers (circa 1350) which have 13 heraldic shields below the parapet, besides the agotrop3ic figures, and a vaulted passage expanded from the Norman gateway (fragments of chevron on former outer arch are visible inside). The present arrangement of the inner ward is largely Salvin's work with a covered entrance with a projecting storey and lamp-bracket at the rear of the Prudhoe Tower and a corbelled corridor at 1st floor level on the east. Mediaeval draw well on the east wall, next to the original doorway to the keep, now a recess The keep, like the curtain walls, is largely mediaeval except for some C18 work on the interior on the west and for the Prudhoe Tower and the Chapel. The interior contrasts with the rugged mediaeval exterior with its sumptuous Renaissance decoration, largely by Italians - Montiroli, Nucci, Strazza, Mantavani and inspired from Italian sources. The chapel with its family gallery at the east end has 4 short rib vaulted bays and a shallow 3-light apse; side walls have mosaics, covered now with tapestry. The grand staircase With its groin vaulted ceiling leads to the Guard Chamber from which an ante-room leads west into the Library (in the Prudhoe Tower) and east into the Music Room (fireplace with Dacian captives by Nucci). Further on are the Red Drawing Room (caryatid fireplace by Nucci) and the Dining Room (ceiling design copied from St Lorenzo f.l.m. in Rome and fireplace with bacchante by Strazza and faun by Nucci). South of the Middle Gateway are Salvin's impressive Kitchen quarters where the oven was designed to burn a ton of coal per day. West of the Stable Courtyard, with C19 Guest Hall at the south end, is the C19 covered riding school, with stable to north of it, and with its west wall forming the east side of Narrowgate. The corner with Bailliffgate has an obtuse angled tower of 2 storeys, with a depressed ogee headed doorway from the street, and merlons.
Listing NGR: NU1863413479
historicengland.org.uk/listing/the-list/list-entry/137130...
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ALNWICK CASTLE
Heritage Category: Park and Garden
Grade: I
List Entry Number: 1001041
National Grid Reference: NU1739315366, NU2254414560
Details
Extensive landscape parks and pleasure grounds developed from a series of medieval deer parks, around Alnwick Castle, the seat of the Percy family since the C14.
Between 1750 and 1786, a picturesque landscape park was developed for Hugh, first Duke of Northumberland, involving work by James Paine, Robert Adam, and the supervision of work by Lancelot Brown (1716-83) and his foremen Cornelius Griffin, Robson, and Biesley in the 1760-80s, working alongside James and Thomas Call, the Duke's gardeners. During the C19 each successive Duke contributed and elaborated on the expansive, planned estate landscape, within which the landscape park was extended. This was accompanied by extensive C19 garden works, including a walled, formal flower garden designed in the early C19 by John Hay (1758-1836), and remodelled mid C19 by William Andrews Nesfield (1793-1881).
NOTE This entry is a summary. Because of the complexity of this site, the standard Register entry format would convey neither an adequate description nor a satisfactory account of the development of the landscape. The user is advised to consult the references given below for more detailed accounts. Many Listed Buildings exist within the site, not all of which have been here referred to. Descriptions of these are to be found in the List of Buildings of Special Architectural or Historic Interest produced by the Department of Culture, Media and Sport.
HISTORIC DEVELOPMENT
In the C13, Hulne Park, West Park, and Cawledge were imparked within the Forest of Alnwick. Hulne Park lay to the north-west of Alnwick Castle and Cawledge to the south and south-east. By the late Middle Ages, Hulne Park extended to 4000 acres (c 1620ha) enclosed by some 13 miles (c 21km) of wall. It was stocked with some 1000 fallow deer and a tower at Hulne Priory served as a hunting lodge. The parks formed the basis of Alnwick Park, landscaped by Sir Hugh Smithson (1714-86) who in 1750 became Earl of Northumberland, inheriting his father-in-law's northern estates. Prior to this, from 1748 he and his wife, Elizabeth Seymour (1716-76), had lived at Stanwick, Yorkshire (qv) and at Syon Park, London (qv), where they had already established a reputation for gardening, attested by Philip Miller's dedication, in 1751, of his Gardener's Dictionary to the Earl.
Together they embarked on an ambitious scheme to restore the Castle, develop the grounds and estate, and restore the Percy family traditions and identity at Alnwick. Those employed at Alnwick were also involved elsewhere on the Northumberland estates: James Paine, architect at Syon House, Daniel Garrett, architect at Northumberland House, the Strand (1750-3), Robert Adam, architect at Syon (1762-9), Lancelot Brown, landscape architect at Syon Park (1754-72).
In 1751, Thomas Call (1717-82), who had been the Earl's gardener at Stanwick, prepared a scheme for the parklands and pleasure grounds, including a plan for Brizlee Hill (the south part of Hulne Park). Call and his relation James, working at Alnwick by 1756, were responsible for the development of Hulne Park over twenty years. The date and extent of Lancelot Brown's involvement at Alnwick is uncertain, although his foremen Griffin, Robson, and Biesley worked at Alnwick with teams of men between 1771and 1781 and records shown that they also worked alongside Call and his men (in 1773 for example, Call had a team of sixty men and Biesley one of seventy-eight).
Hulne Park was developed as a picturesque pleasure ground with extensive rides, follies, and the enhancement of natural features. A characteristic of the Duke's scheme was his recognition of antiquarian sites within the landscape, which were embellished. Thus in 1755, Hulne Priory was purchased to become the focal point of Hulne Park. A garden was made within the cloister walls and, from c 1763, the priory became the gamekeeper's residence, with a menagerie of gold and silver pheasants. Statues of friars cut by the mason Matthew Mills were set in the landscape. In 1774, a medieval commemorative cross to Malcolm Canmore (listed grade II), situated at the northern entrance to the North Demesne, was restored.
Following the Duchess' death in 1776, the Duke decorated all her favourite locations with buildings, some being ideas she had noted in her memoranda. Work also included other notes and ideas the Duchess had had, including the ruin at Ratcheugh Crag and some ninety-eight drives and incidents.
Plans for the parklands at the North Demesne, Denwick, and Ratcheugh Crags were developed in the late 1760s, although in the case of the North Demesne some parkland planting had been undertaken by 1760, and the major work undertaken in the early 1770s is that attributed to Brown, mainly on stylistic grounds.
During the C19, under the second Duke (1742-1817) the parks were extended, this including the purchase of Alnwick Abbey and part of its estate. The complex of drives was also extended and this was accompanied by extensive plantations, including the large Bunker Hill plantation central to the north area of Hulne Park, named to commemorate the Duke's action in 1775 in the War of American Independence. Most significantly, between 1806 and 1811, building centred on construction of a perimeter wall, defining the boundary of Hulne Park, and lodges and gateways at entrances to the parks. The carriage drives were extended, necessitating the construction of bridges over the River Aln. These schemes were implemented by estate workers, local masons, and David Stephenson, the Duke's architect.
As the Castle had no formal flower gardens, John Hay was commissioned between 1808 and 1812 to design pleasure gardens to the south-east of the Castle, linking it with a new walled garden at Barneyside, furnished with a range of hothouses, glasshouses, and pine pits. These were extended in the 1860s when Anthony Salvin, employed in the restoration of the Castle, built a gateway between the inner bailey and the pleasure gardens. Nesfield designed a scheme for the walled gardens to be developed as an ornamental flower and fruit garden, with a large central pool, conservatory, and a series of broad terraces and parterres. The Alnwick scheme can be compared to Nesfield's in the precincts of Arundel Castle, West Sussex (qv), in 1845.
Alnwick Castle, parks and estate remain (2000) in private ownership, the latest significant developments being the replanting and restoration of the North Demesne (1990s) and plans to completely remodel the walled garden.
SUMMARY DESCRIPTION
Alnwick Castle parks cover a tract of countryside encircling Alnwick town on its west, north, north-east, and south sides. The land is a mixture of contrasting landscape types, with high heather moorland and the rough crags of the Northumbrian Sandstone Hills sweeping down to the improved pasture lands along the wooded Aln valley. The parks exploit the boundaries of these distinctive landforms where the rugged moorland gives way to the pastoral, rolling landscape of the Aln, on its route to the sea. In the west parklands the river is confined between hills, and in places has incised deep, narrow valleys while in the east the landscape is more open.
The registered area of 1300ha is bounded on its north-east side by the Hulne Park wall, west of the Bewick to Alnwick Road (B6346). The west side of the area here registered follows field boundaries to the west of Shipley Burn, starting at Shipley Bridge, and then turns south-west at a point c 1km south of the bridge. It then runs for south-west for c 2.3km, to the west of Hulne Park, before crossing the River Aln and running parallel to Moorlaw Dean for c 1.2km, on the west side of the burn. The southern area is defined by Hulne Park wall running around the south point of Brizlee Wood then in a line due east, south of Cloudy Crags drive, to cross the Stocking Burn and reach Forest Lodge. The boundary then defines the north-western extent of Alnwick town and, crossing the Canongate Bridge, the southernmost extent of the Dairy Grounds.
To the east of the Castle the registered area takes in the entire North Demesne bounded on its north by Long Plantation, a perimeter belt which lies on the south side of Smiley Lane and then extends eastwards to meet the junction of the B1340 and A1 trunk road. The A1 has effectively cut through the North Demesne from north to south and, although physically divorcing the two areas, they are still visually conjoined. Defined on its north side within the hamlet of Denwick by tree belts, the park extends eastwards for 1km before cutting across southwards to meet the River Aln at Lough House. This latter stretch is bounded by a perimeter belt. The south boundary of the North Demesne follows the river in part, before meeting the Alnwick to Denwick road (B1340). To the south, the Castle gardens are delimited from the town by property boundaries along Bondgate. An outlying area of designed landscape at Ratcheugh is also included.
A complex series of drives is laid throughout the parks, particularly in Hulne Park. A series of thirty standing stones stand at the beginning of the drives or where they converge. These are inscribed with the names of the drives and act as signposts.
Alnwick Castle (1134 onwards, c 1750-68 by James Paine and Robert Adam, 1854-6 by Anthony Salvin, listed grade I) lies on the high ground on the south side of the Aln valley, commanding views to the north, east, and west. To the south is Alnwick town but the landscape is designed so that the town is not in view of the Castle. The principal views from the Castle lie over the North Demesne.
The North Demesne originally included Denwick Park (they have now been divided by the A1 road), and together these 265ha form the core parkland designed by Brown. Perimeter tree belts define the park, and clumps and scatters of specimen trees ornament the ground plan. The Aln has been dammed to give the appearance of an extensive, natural serpentine lake, with bridges as focal points: the Lion Bridge (John Adam 1773, listed grade I) and Denwick Bridge (1766, probably also by Adam, listed grade I). A programme of replanting and restoration of the North Demesne is under way (late 1990s).
The medieval deer park of Hulne extended to the north of the Shipley Road (outside the area here registered). Hulne Park is now 1020ha and is in agricultural and forestry use. The principal entrance from Alnwick town is Forest Lodge, the only extant part of Alnwick Abbey. Hulne Park is completely enclosed by an early C19 perimeter wall, c 3m high with shaped stone coping and buttresses every 20m. Nearly 5km of wall lies alongside roads, 5km across fields, and 5km defines perimeter woodland and moorland from the enclosed park.
The park design consists of a series of oval-shaped enclosures, defined by tree belts vital for shelter. The highest point is in the west area of the park, from where there are long-distance views east to the sea. The River Aln winds its way through the park via a series of contrasting steep valleys and flatter lands. The valleys are emphasised by planting on the upper slopes, while the lower areas are encircled with designed plantations to emphasise the river's meanders and ox-bow lakes.
Picturesque incidents survive at Nine Year Aud Hole, where the statue of a hermit (late C18, listed grade II) stands at the entrance to a natural cave along Cave Drive, and at Long Stone, a monolith standing high on the west side of Brizlee Hill, with panoramic views over Hulne Park to the north-west. The picturesque highlight is Hulne Priory (original medieval buildings, C18 alterations and enhancements, all listed grade I), which includes a summerhouse designed by Robert Adam (1778-80, listed grade I) and statues of praying friars erected in the Chapter House (late C18). The Priory's picturesque qualities are well appreciated from Brizlee Tower (Robert Adam, listed grade I), built in 1781 to commemorate the creation of the Alnwick parks by the first Duke and Duchess, a Latin inscription stating:
Circumspice! Ego omnia ista sum dimensus; Mei sunt ordines, Mea descriptio Multae etiam istarum arborum Mea manu sunt satae. [Look about you. I have measured all these things; they are my orders; it is my planning; many of these trees have been planted by my own hand.]
Brizlee is sited on a high point which can be seen in views north-west from the Castle, mirroring views north-east to the 'Observatory' on Ratcheugh Crag, a sham ruined castle sited as an eyecatcher on high ground and built by John Bell of Durham in 1784 (plans to further elaborate it were designed by Robert Adam).
Another principal feature of Hulne Park is a series of regular, walled enclosures (the walls set in ditches with banks cast up inside the compounds) which line Farm Drive, the central road through the park, north-westwards from Moor Lodge. This functioned as the third Duke's menagerie, and is still pasture.
The 15ha Dairy Ground links Hulne Park and the North Demesne. It principally consists of the Aln valley north-west of the Castle, stretching between Canongate Bridge and Lion Bridge, laid out as pleasure gardens. Barbara's Bank and the Dark Walk are plantations laid out with walks on the steep slopes with a Curling Pond to the north of the Aln.
The walled garden of 3ha lies to the south-east of the Castle, reached by the remains of C19 pleasure gardens laid out on the slopes above Barneyside. After the Second World War use of the glasshouses ceased, and until recently (late 1990s) the Estate Forestry Department used it. The earthwork terraces and remnants of specimen planting of Nesfield's scheme survive.
REFERENCES
Note: There is a wealth of material about this site. The key references are cited below.
The Garden, 5 (1874), pp 100-1, 188; 20 (1881), pp 155-6 Gardeners' Chronicle, ii (1880), pp 523-4, 587; ii (1902), pp 273-4 J Horticulture and Cottage Gardener 15, (1887), pp 296-8 P Finch, History of Burley on the Hill (1901), p 330 Country Life, 65 (22 June 1929), pp 890-8; 66 (6 July 1929), pp 16-22; 174 (4 August 1983), p 275 D Stroud, Capability Brown (1975), pp 103-4 Garden History 9, (1981), pp 174-7 Capability Brown and the Northern Landscape, (Tyne & Wear County Council Museums 1983), pp 19, 22-3, 27, 42 Restoration Management Plan, Alnwick Castle, (Land Use Consultants 1996) C Shrimpton, Alnwick Castle, guidebook, (1999)
Description written: August 2000 Resgister Inspector: KC Edited: June 2003
historicengland.org.uk/listing/the-list/list-entry/100104...
See also:-
Soil as I’ve never thought of it before. The complexity of it and interconnectedness of it. Here lies the science behind biodynamic farming, the homeopathy of it developed by Rudolph Steiner (yes of the Waldorf schools). Published in 1989 the techniques described here are so far from our industrial chemical farming that it is clear they’ve been actively suppressed. No surprise there. Relates how the father of chemical agriculture, a chemist decided that plants survived on only 3 chemical nitrogen, phosphorus and potash the NPK chemical additives. Having completely ignored the role of humus it took another ten years for this scientist to realize he was wrong, but too late; much money was already being made on the chemicals and the destruction of soil and subsequently soil health, food quality and human health was well underway. All due to the compartmentalization of knowledge.
At much the same time a British colonel stationed in India, Sir Albert Howard rediscovered the value of humus as used in India and along with Lady Eve Balfour started the organic movement in England which was then picked up by J. I. Rodale in the States. Still to no avail as we know. But at least discoveries continued and organic farming maintained a toehold.
Written as a series of visits to leaders in the field and their farms to discover how biodynamic theories are put into action the book fleshes out the science of each visit and how it relates to create a whole that is astonishing in its breadth.
Fresh cow manure stuffed into desiccated cow horns buried for a year creates a humus so potent that a fourth of a cup stirred into 3 gallons of rainwater would revitalize an entire acre. Much method in the stirring of this homeopathic preparation 500. The first of 7 such esoteric mixtures. The stirring invoking energies of the cosmos to enter into it as well as the intentions of the stirrer. A vortex is created in one direction then reversed to elicit chaos. For an hour this brew must be stirred. Then it is sprayed onto the field.
Moonshine and particular calendar days relating to constellations also play a part in when potions are applied and seeds started, cows are bred etc. The “biodynamic calendar of sowing” nailing down all these auspicious days.
Others carried on Steiner’s work creating compost on a city wide scale in San Francisco. The better to enliven the microbiota in the soil. Australia was the first to put into practice on a broader basis the application of Steiner’s preparations due to a documentary shown on TV highlighting impressive results to the fertility of the land. Rotation of crops also played a part.
A chapter on the Hunza and Hunzakuts known for their health and longevity serves to demonstrate how those who live an entirely sustainable organic lifestyle are free from disease living a robust and healthy life long into old age. The secret of their health—powdered glacial rock containing all the minerals required by plants. It was also in the water, the vortex of its movement that provided clues to the colloidal chemistry that were the sources of life. The study of chelation by Albert Schatz in turn reveals how soil humus extracts minerals. Chelating acids are created by bacteria in the soil and this is how plants can take up the minerals. Such discovery was of no interest to the U.S. agricultural industry and it was in an Indian publication that his work was published.
We are also introduced to a Dan Carlson who discovered that certain forms of music — jazz or Ravi Shankar — prompted growth in plants at four times the normal rate while hard rock killed them. But his fast growing vine not being edible was of no monetary interest so he entered it into the Guiness Book of Records. He was also able to influence the plants characteristics by informing them they no longer needed thorns or meditating on what color he wanted the blooms. Other such botanical feats of growth also described.
The work of Wes Jackson focuses on the effects of weeds used as companion plants on crops. How weeds improve the soil loosening it and adding humus for the benefit of the crops while also providing mulch services to protect from drought.
Dust i.e. azomite. Works like fertilizer. Plant discoveries continue to slay long held assumptions. This one pertaining to how plants can ingest much larger particles than originally thought.
A curious chapter describes how a man from India is touring the U.S. demonstrating that the atmosphere can be purified by creating a little fire to burn cow dung, Basamati rice, ghee and a pinch of sandalwood inside an inverted copper ziggurat shaped bowl. Found to neutralize radiation and other pollutants. Those present feel the air becoming fresh again. The smoke gathers the molecules and neutralizes them.
Even stranger was a method described to get rid of mice and other pests prescribed by Steiner. The method requires that a mouse be skinned and the skin burned. Then the ashes peppered over the field where the mice are not wanted. Done when Venus is in the sign of Scorpio. The same for getting rid of insects. Their sensitive antennas pick up the infrared bands. The effects of the treatment is described as a counter force to the life force of the insect that prompts it to vacate. Observation speculates that the insects communicate and react to different prisms of light.
Monks meditating in stone towers collect cosmic paramagnetic energy and focus it onto their fields to increase paramagnetic waves in the soil as theorized by Professor Philip S. Callahan. The plants grow bigger for it. A farmer and a business man partnered to try out this method to good effect with 17 towers placed around their fields.
A woman Machaelle Wright of Perlandra gets in touch with Deva spirits just by going in the field and declaring her intention out loud asking the deva how to rebalance a plant that is beset by aphids and such or brokering deals with pests that they can eat the cabbage at the ends of rows.
The final chapter introduces us to a Russian energy worker with telekinetic powers, Alla Kudryashova, who is able to imbue water with healing properties that can also be applied to agriculture and livestock. Studies were done demonstrating her considerable impact on the growth of broiler chickens, wheat and beets. She was also able to fix delicate machinery prompting those studying her to wonder if the spiritual dimension existed not just in live material, but in a dimension of its own. Shamans would say she was using direct revelation to harness this power.
These last two women parallel Steiner’s spiritual dimension in his work involving intention.
By the end of the book I was convinced that biodynamic farming was the optimum way to collaborate with the intelligence of plants, soil and the planet. We have truly underestimated this intelligence in our arrogance to improve on creation much as we have the intelligence of the body and the connection to spirit. Written in 1989, plenty of time for people to have further studied what was introduced here.
"La complessità non è la complicazione. Ciò che è complicato può essere ridotto a un principio semplice e se la situazione fosse solo complicata, cioè intricata e multidipendente, forse sarebbe sufficiente effettuare delle riduzioni ( atomi-particelle, fonemi del linguaggio, basi del codice genetico ecc.). Questo approccio però purtroppo non spiega nulla anche se spesso pretende di spiegare tutto. Il problema vero è che è inutile cercare di convertire ciò che è complicato in regole con una base semplice, ma si tratta invece di accettare il fatto che alla base di tutto c'è la complessità"
A CALL TO ACTION TO BUILD BELOVED COMMUNITY
SOUTHERNERS ON NEW GROUND & ALTERNATE ROOTS
CHARLESTON MARKET HALL
Charleston, SC
MONDAY, JANUARY 21, 2013
Today, as we commemorate freedom fighter Dr. Martin Luther King Jr., and as President Barack Obama is inaugurated for his second term, we gather on contested ground to promote Dr. King’s vision of Beloved Community. We gather because the current symbolism of Charleston is rooted in its history as a pro-slavery Port City and it does not reflect our histories, our struggles, or our resistances. We gather because the face of Charleston should show the diversity and complexity of our lives and histories. We do not glorify the bloodshed, violence and horror of chattel slavery that built this city. We recognize this history as people of color, and as lesbian, gay, bisexual, transgender, and queer people, and we know that we have a shared stake in transforming this city. We gather today because, in this time of great peril and great possibility, we believe in redemption!
We call on all Southern people to build King’s vision of Beloved Community! We must undergo a transformation of our collective values in order to end what King called “the giant triplets of racism, materialism, and militarism”. We need a revolution of our values that spans in scale from the conversations we have with our kids over breakfast to the way whole communities relate internationally. To do this, we must weave a strong new social fabric between us. We call on our communities, locally, nationally, and globally, to step boldly over the lines of race, gender, class, religion, and sexuality that isolate us from one another. We call on you, our sisters and brothers in struggle, to meet each other as neighbors and friends, to collaborate to make King’s dream of Beloved Community come true.
We dream, too. We dream of an end to racism, an end to poverty, an end to military terror. We dream of queer liberation, of community gardens that grow where prisons and detention centers have closed. We dream of safety for all children, we dream of a place where every person is able to achieve their full humanity. We know that these dreams are not impossible or idealistic, but absolutely necessary if we are all to survive and thrive. In the word’s of Fannie Lou Hamer, “Nobody’s free ‘til everybody’s free!”
It is with increasing urgency that we gather today to make visible our renewed commitment to Southern Freedom Movement, the same movement that swept the South in the 60’s and broke the back of Jim Crow. On this day, hundreds of other organizations and communities are gathering in their home towns, sharing their dreams for their lives and the lives of their children. We stand in solidarity with people all over the South who are organizing to solve problems in their communities, who are resisting poverty, resisting racism, resisting obliteration of our lives and our cultures. We will not be erased! We are your neighbors, your family members and friends; we are your teachers, your grandmothers, we are people of faith; and we are queers, we are sex workers, we are youth in the streets, we are undocumented and unafraid! We will leave no one in our Beloved Communities behind!
We stand in solidarity with People’s First 100 Days Actions today in Jacksonville, FL; San Antonio, TX; Atlanta, GA; Durham and Greensboro, NC; Dothan, AL; Knoxville, TN; Houston, TX; Asheville, NC; Tunica, MS Little Rock, AR; and all other cities and towns where Southern Freedom Movement is rising to the call of a new day. And, because we know that Southern people are not alone in this struggle, we stand in solidarity with oppressed people everywhere. In a time of charismatic leaders, we decide instead to look to ourselves, because we are the leaders we have been waiting for. Together, we will rise and transform the South’s legacy of division, fear and hate into a New South, a Beloved Community that we can ALL be proud of. In the words of Dr. King, “We shall overcome, because the arc of the moral universe is long, but it bends toward justice."
photo by Savannah Brennan
Florenz - Kathedrale
seen from Piazzale Michelangelo
gesehen vom seen Piazzale Michelangelo
Florence Cathedral (Italian: Duomo di Firenze), formally the Cathedral of Saint Mary of the Flower (Italian: Cattedrale di Santa Maria del Fiore [katteˈdraːle di ˈsanta maˈriːa del ˈfjoːre]), is the cathedral of Florence, Italy. It was begun in 1296 in the Gothic style to a design of Arnolfo di Cambio and was structurally completed by 1436, with the dome engineered by Filippo Brunelleschi. The exterior of the basilica is faced with polychrome marble panels in various shades of green and pink, bordered by white, and has an elaborate 19th-century Gothic Revival façade by Emilio De Fabris.
The cathedral complex, in Piazza del Duomo, includes the Baptistery and Giotto's Campanile. These three buildings are part of the UNESCO World Heritage Site covering the historic centre of Florence and are a major tourist attraction of Tuscany. The basilica is one of Italy's largest churches, and until the development of new structural materials in the modern era, the dome was the largest in the world. It remains the largest brick dome ever constructed.
The cathedral is the mother church of the Archdiocese of Florence, whose archbishop is Giuseppe Betori.
History
Santa Maria del Fiore was built on the site of Florence's second cathedral dedicated to Saint Reparata; the first was the Basilica di San Lorenzo di Firenze, the first building of which was consecrated as a church in 393 by St. Ambrose of Milan.The ancient structure, founded in the early 5th century and having undergone many repairs, was crumbling with age, according to the 14th-century Nuova Cronica of Giovanni Villani, and was no longer large enough to serve the growing population of the city. Other major Tuscan cities had undertaken ambitious reconstructions of their cathedrals during the Late Medieval period, such as Pisa and particularly Siena where the enormous proposed extensions were never completed.
City council approved the design of Arnolfo di Cambio for the new church in 1294. Di Cambio was also architect of the church of Santa Croce and the Palazzo Vecchio. He designed three wide naves ending under the octagonal dome, with the middle nave covering the area of Santa Reparata. The first stone was laid on 9 September 1296, by Cardinal Valeriana, the first papal legate ever sent to Florence. The building of this vast project was to last 140 years; Arnolfo's plan for the eastern end, although maintained in concept, was greatly expanded in size.
After Arnolfo died in 1302, work on the cathedral slowed for almost 50 years. When the relics of Saint Zenobius were discovered in 1330 in Santa Reparata, the project gained a new impetus. In 1331, the Arte della Lana, the guild of wool merchants, took over patronage for the construction of the cathedral and in 1334 appointed Giotto to oversee the work. Assisted by Andrea Pisano, Giotto continued di Cambio's design. His major accomplishment was the building of the campanile. When Giotto died on 8 January 1337, Andrea Pisano continued the building until work was halted due to the Black Death in 1348.
In 1349, work resumed on the cathedral under a series of architects, starting with Francesco Talenti, who finished the campanile and enlarged the overall project to include the apse and the side chapels. In 1359, Talenti was succeeded by Giovanni di Lapo Ghini (1360–1369) who divided the centre nave in four square bays. Other architects were Alberto Arnoldi, Giovanni d'Ambrogio, Neri di Fioravanti and Andrea Orcagna. By 1375, the old church Santa Reparata was pulled down. The nave was finished by 1380, and only the dome remained incomplete until 1418.
On 19 August 1418, the Arte della Lana announced an architectural design competition for erecting Neri's dome. The two main competitors were two master goldsmiths, Lorenzo Ghiberti and Filippo Brunelleschi, the latter of whom was supported by Cosimo de Medici. Ghiberti had been the winner of a competition for a pair of bronze doors for the Baptistery in 1401 and lifelong competition between the two remained sharp. Brunelleschi won and received the commission.
Ghiberti, appointed coadjutor, drew a salary equal to Brunelleschi's and, though neither was awarded the announced prize of 200 florins, was promised equal credit, although he spent most of his time on other projects. When Brunelleschi became ill, or feigned illness, the project was briefly in the hands of Ghiberti. But Ghiberti soon had to admit that the whole project was beyond him. In 1423, Brunelleschi was back in charge and took over sole responsibility.
Work on the dome began in 1420 and finished in 1436. The cathedral was consecrated by Pope Eugene IV on 25 March 1436, (the first day of the year according to the Florentine calendar). It was the first 'octagonal' dome in history to be built without a temporary wooden supporting frame. It was one of the most impressive projects of the Renaissance. During the consecration in 1436, Guillaume Dufay's motet Nuper rosarum flores was performed.
The decoration of the exterior of the cathedral, begun in the 14th century, was not completed until 1887, when the polychrome marble façade was completed with the design of Emilio De Fabris. The floor of the church was relaid in marble tiles in the 16th century.
The exterior walls are faced in alternate vertical and horizontal bands of polychrome marble from Carrara (white), Prato (green), Siena (red), Lavenza and a few other places. These marble bands had to repeat the already existing bands on the walls of the earlier adjacent baptistery the Battistero di San Giovanni and Giotto's Bell Tower. There are two side doors: the Doors of the Canonici (south side) and the Door of the Mandorla (north side) with sculptures by Nanni di Banco, Donatello, and Jacopo della Quercia. The six side windows, notable for their delicate tracery and ornaments, are separated by pilasters. Only the four windows closest to the transept admit light; the other two are merely ornamental. The clerestory windows are round, a common feature in Italian Gothic.
Exterior
Plan and structure
The cathedral of Florence is built as a basilica, having a wide central nave of four square bays, with an aisle on either side. The chancel and transepts are of identical polygonal plan, separated by two smaller polygonal chapels. The whole plan forms a Latin cross. The nave and aisles are separated by wide pointed Gothic arches resting on composite piers.
The dimensions of the building are enormous: building area 8,300 m2 (89,340 sq ft), length 153 m (502 ft), width 38 m (125 ft), width at the crossing 90 m (300 ft). The height of the arches in the aisles is 23 m (75 ft). The height of the dome is 114.5 m (375.7 ft). It has the fifth tallest dome in the world.
Planned sculpture for the exterior
The Overseers of the Office of Works of Florence Cathedral the Arte della Lana, had plans to commission a series of twelve large Old Testament sculptures for the buttresses of the cathedral. Donatello, then in his early twenties, was commissioned to carve a statue of David in 1408, to top one of the buttresses of Florence Cathedral, though it was never placed there. Nanni di Banco was commissioned to carve a marble statue of Isaiah, at the same scale, in the same year. One of the statues was lifted into place in 1409, but was found to be too small to be easily visible from the ground and was taken down; both statues then languished in the workshop of the opera for several years. In 1410 Donatello made the first of the statues, a figure of Joshua in terracotta. In 1409–1411 Donatello made a statue of Saint John the Evangelist which until 1588 was in a niche of the old cathedral façade. Between 1415 and 1426, Donatello created five statues for the campanile of Santa Maria del Fiore in Florence, also known as the Duomo. These works are the Beardless Prophet; Bearded Prophet (both from 1415); the Sacrifice of Isaac (1421); Habbakuk (1423–25); and Jeremiah (1423–26); which follow the classical models for orators and are characterized by strong portrait details. A figure of Hercules, also in terracotta, was commissioned from the Florentine sculptor Agostino di Duccio in 1463 and was made perhaps under Donatello's direction. A statue of David by Michelangelo was completed 1501–1504 although it could not be placed on the buttress because of its six-ton weight. In 2010 a fiberglass replica of "David" was placed for one day on the Florence cathedral.
Dome
After a hundred years of construction and by the beginning of the 15th century, the structure was still missing its dome. The basic features of the dome had been designed by Arnolfo di Cambio in 1296. His brick model, 4.6 m (15.1 ft) high, 9.2 m (30.2 ft) long, was standing in a side aisle of the unfinished building, and had long been sacrosanct. It called for an octagonal dome higher and wider than any that had ever been built, with no external buttresses to keep it from spreading and falling under its own weight.
The commitment to reject traditional Gothic buttresses had been made when Neri di Fioravanti's model was chosen over a competing one by Giovanni di Lapo Ghini. That architectural choice, in 1367, was one of the first events of the Italian Renaissance, marking a break with the Medieval Gothic style and a return to the classic Mediterranean dome. Italian architects regarded Gothic flying buttresses as ugly makeshifts. Furthermore, the use of buttresses was forbidden in Florence, as the style was favored by central Italy's traditional enemies to the north. Neri's model depicted a massive inner dome, open at the top to admit light, like Rome's Pantheon, partly supported by the inner dome, but enclosed in a thinner outer shell, to keep out the weather. It was to stand on an unbuttressed octagonal drum. Neri's dome would need an internal defense against spreading (hoop stress), but none had yet been designed.
The building of such a masonry dome posed many technical problems. Brunelleschi looked to the great dome of the Pantheon in Rome for solutions. The dome of the Pantheon is a single shell of concrete, the formula for which had long since been forgotten. The Pantheon had employed structural centring to support the concrete dome while it cured. This could not be the solution in the case of a dome this size and would put the church out of use. For the height and breadth of the dome designed by Neri, starting 52 m (171 ft) above the floor and spanning 44 m (144 ft), there was not enough timber in Tuscany to build the scaffolding and forms. Brunelleschi chose to follow such design and employed a double shell, made of sandstone and marble. Brunelleschi would have to build the dome out of brick, due to its light weight compared to stone and being easier to form, and with nothing under it during construction. To illustrate his proposed structural plan, he constructed a wooden and brick model with the help of Donatello and Nanni di Banco, a model which is still displayed in the Museo dell'Opera del Duomo. The model served as a guide for the craftsmen, but was intentionally incomplete, so as to ensure Brunelleschi's control over the construction.
Brunelleschi's solutions were ingenious. The spreading problem was solved by a set of four internal horizontal stone and iron chains, serving as barrel hoops, embedded within the inner dome: one at the top, one at the bottom, with the remaining two evenly spaced between them. A fifth chain, made of wood, was placed between the first and second of the stone chains. Since the dome was octagonal rather than round, a simple chain, squeezing the dome like a barrel hoop, would have put all its pressure on the eight corners of the dome. The chains needed to be rigid octagons, stiff enough to hold their shape, so as not to deform the dome as they held it together.
Each of Brunelleschi's stone chains was built like an octagonal railroad track with parallel rails and cross ties, all made of sandstone beams 43 cm (17 in) in diameter and no more than 2.3 m (7.5 ft) long. The rails were connected end-to-end with lead-glazed iron splices. The cross ties and rails were notched together and then covered with the bricks and mortar of the inner dome. The cross ties of the bottom chain can be seen protruding from the drum at the base of the dome. The others are hidden. Each stone chain was supposed to be reinforced with a standard iron chain made of interlocking links, but a magnetic survey conducted in the 1970s failed to detect any evidence of iron chains, which if they exist are deeply embedded in the thick masonry walls. Brunelleschi also included vertical "ribs" set on the corners of the octagon, curving towards the center point. The ribs, 4 m (13 ft) deep, are supported by 16 concealed ribs radiating from center.The ribs had slits to take beams that supported platforms, thus allowing the work to progress upward without the need for scaffolding.
A circular masonry dome can be built without supports, called centering, because each course of bricks is a horizontal arch that resists compression. In Florence, the octagonal inner dome was thick enough for an imaginary circle to be embedded in it at each level, a feature that would hold the dome up eventually, but could not hold the bricks in place while the mortar was still wet. Brunelleschi used a herringbone brick pattern to transfer the weight of the freshly laid bricks to the nearest vertical ribs of the non-circular dome.
The outer dome was not thick enough to contain embedded horizontal circles, being only 60 cm (2 ft) thick at the base and 30 cm (1 ft) thick at the top. To create such circles, Brunelleschi thickened the outer dome at the inside of its corners at nine different elevations, creating nine masonry rings, which can be observed today from the space between the two domes. To counteract hoop stress, the outer dome relies entirely on its attachment to the inner dome and has no embedded chains.
A modern understanding of physical laws and the mathematical tools for calculating stresses were centuries in the future. Brunelleschi, like all cathedral builders, had to rely on intuition and whatever he could learn from the large scale models he built. To lift 37,000 tons of material, including over 4 million bricks, he invented hoisting machines and lewissons for hoisting large stones. These specially designed machines and his structural innovations were Brunelleschi's chief contribution to architecture. Although he was executing an aesthetic plan made half a century earlier, it is his name, rather than Neri's, that is commonly associated with the dome.
Brunelleschi's ability to crown the dome with a lantern was questioned and he had to undergo another competition, even though there had been evidence that Brunelleschi had been working on a design for a lantern for the upper part of the dome. The evidence is shown in the curvature, which was made steeper than the original model. He was declared the winner over his competitors Lorenzo Ghiberti and Antonio Ciaccheri. His design (now on display in the Museum Opera del Duomo) was for an octagonal lantern with eight radiating buttresses and eight high arched windows. Construction of the lantern was begun a few months before his death in 1446. Then, for 15 years, little progress was possible, due to alterations by several architects. The lantern was finally completed by Brunelleschi's friend Michelozzo in 1461. The conical roof was crowned with a gilt copper ball and cross, containing holy relics, by Verrocchio in 1469. This brings the total height of the dome and lantern to 114.5 m (376 ft). This copper ball was struck by lightning on 17 July 1600 and fell down. It was replaced by an even larger one two years later.
The commission for this gilt copper ball [atop the lantern] went to the sculptor Andrea del Verrocchio, in whose workshop there was at this time a young apprentice named Leonardo da Vinci. Fascinated by Filippo's [Brunelleschi's] machines, which Verrocchio used to hoist the ball, Leonardo made a series of sketches of them and, as a result, is often given credit for their invention.
Leonardo might have also participated in the design of the bronze ball, as stated in the G manuscript of Paris "Remember the way we soldered the ball of Santa Maria del Fiore".
The decorations of the drum gallery by Baccio d'Agnolo were never finished after being disapproved by no one less than Michelangelo.
A huge statue of Brunelleschi now sits outside the Palazzo dei Canonici in the Piazza del Duomo, looking thoughtfully up towards his greatest achievement, the dome that would forever dominate the panorama of Florence. It is still the largest masonry dome in the world.
The building of the cathedral had started in 1296 with the design of Arnolfo di Cambio and was completed in 1469 with the placing of Verrochio's copper ball atop the lantern. But the façade was still unfinished and would remain so until the 19th century.
Facade
The original façade, designed by Arnolfo di Cambio and usually attributed to Giotto, was actually begun twenty years after Giotto's death. A mid-15th-century pen-and-ink drawing of this so-called Giotto's façade is visible in the Codex Rustici, and in the drawing of Bernardino Poccetti in 1587, both on display in the Museum of the Opera del Duomo. This façade was the collective work of several artists, among them Andrea Orcagna and Taddeo Gaddi. This original façade was completed in only its lower portion and then left unfinished. It was dismantled in 1587–1588 by the Medici court architect Bernardo Buontalenti, ordered by Grand Duke Francesco I de' Medici, as it appeared totally outmoded in Renaissance times. Some of the original sculptures are on display in the Museum Opera del Duomo, behind the cathedral. Others are now in the Berlin Museum and in the Louvre.
The competition for a new façade turned into a huge corruption scandal. The wooden model for the façade of Buontalenti is on display in the Museum Opera del Duomo. A few new designs had been proposed in later years, but the models (of Giovanni Antonio Dosio, Giovanni de' Medici with Alessandro Pieroni and Giambologna) were not accepted. The façade was then left bare until the 19th century.
In 1864, a competition held to design a new façade was won by Emilio De Fabris (1808–1883) in 1871. Work began in 1876 and was completed in 1887. This neo-gothic façade in white, green and red marble forms a harmonious entity with the cathedral, Giotto's bell tower and the Baptistery, but some think it is excessively decorated.
The whole façade is dedicated to the Mother of Christ.
Cracking of the dome
The unreinforced masonry that Brunelleschi used to construct the dome is weak in tension which leads to cracking when tensile stresses exceed the limited masonry tensile strength. The material is especially susceptible to damage from seismic loading due to its heterogeneity and many surfaces between different materials (stones to mortar connection).
Cracking of the dome was observed even before its construction was completed. It is possible that the first cracks were caused by a strong earthquake in 1453.[
The first written evidence about the presence of cracks appears in a report by Gherardo Silvani report dated 18 September 1639 which refers to "peli" ("hairs"). In 1694 Gianbattista Nelli and Vincenzo Viviani surveyed the cracks with Nelli recording that there were two major cracks with a maximum width of 29 mm (1.1 in). They believed that the cracks were caused by the weight of the dome, and the resulting the horizontal thrusts on the pillars. A commission, headed by Vincenzo Viviani carried out investigations in 1695 and came to the conclusion that the cracking was due to the dead weight of the buildings, it was proposed that the dome be strengthened by installing four large iron belts; three on the outside of the dome between the bugling area of the dome and the circular windows, while the fourth would be installed internally in the second walkway between the two shells. This was similar to what had been done on the dome of St. Peter's in Rome. After a long debate, a decision was made to leave the dome as it was.
The first most complete survey of the cracks was published in 1757 by the Jesuit Leonardo Ximenes (1716–1786). In his document he described 13 different crack typologies. In 1934, Pier Luigi Nervi, who was head of a special commission established by the Opera del Duomo to study the cracking observed that the cracks opened and closed with the seasons. In the winter, the dome's stone and bricks would contract causing the cracks to widen while over the summer the materials would expand and the cracks would close up. While modern buildings by design incorporate expansion joints, the cathedral's dome does not include any and so subsequently developed its own expansion joints in the form of these cracks which allowed the structure to "breathe". To date they have not caused any catastrophic damage to the dome.
In 1955 the Opera del Duomo installed 22 mechanical deformometers, which were read four times a year to record the variations in the width of the major cracks in the inner dome. At the same time the dome's internal and external temperatures were also recorded. This remained in service until 2009.
In 1975 a commission was appointed by the Italian government to safeguard the dome. In 1978 a government culture agency decided to restore the frescoes. Brunelleschi left forty eight 600 mm (24 in) holes in the base of the dome. They are open on the inside and covered by the outer skin of the dome. It has long been assumed that the holes simply served as mounts for the scaffold used when frescoes were painted on the inside of the dome. While the holes had been able to support the scaffolding used for the creation of the frescos on the interior of the dome they were not strong enough for the network of modern metal scaffolding necessary to provide access for the restoration work undertaken on the frescos between 1979 and 1995. To strengthen the scaffolding, the private company contracted to build scaffolding for the work was allowed in 1982 to fill the holes with concrete so that steel beams could be anchored in them.
In 1985 local architect Lando Bartoli noticed that additional cracks were forming around the sealed holes. It was theorized at the time that in summer the four major masses separated by the "A" cracks expanded into the fissures, but now, at the base of the dome, the masses come up against the unyielding concrete that now fills the 48 holes acts as a fulcrum which causes the energy that was once dissipated with the closing of the fissures and into the holes to be transferred into the upper areas of the dome. However analysis by Andrea Chiarugi, Michele Fanelli and Giuseppetti (published in 1983) found that the principal source of the cracks was a dead-weight effect due to the geometry of the dome, its weight (estimated to be 25,000 tons) and the insufficient resistance of the ring beam, while thermal variations, has caused fatigue loading and thus expanding of the structure. This is a well-known collapse mechanism typical of domed structures: a lowering of the top of the structure under its own weight with significant horizontal thrusts on the bearing elements.
In 1985 a commission established by the Italian Ministry of Cultural and Monumental Heritage accepted this theory. The debate about the filling of the scaffolding holes was finally settled in 1987 when it was demonstrated that closing the 48 holes had had no impact on the expansion and contraction of the dome. A survey completed in 1984 counted a total of 493 cracks of various sizes, sorted into categories identified by the letters "A" through "D". These are as follows:
Type A. These are sub-vertical major cracks that start from the ring beam and continue upwards for approximately two-thirds of the height of the dome; they pass through both the internal and external layer of the even webs and their range in thickness from 55 mm (2.2 in) to 60 mm (2.4 in) (webs 4 and 6) and 25 mm (0.98 in) to 30 mm (1.2 in) (webs 2 and 8). The dome has eight webs numbered counter clockwise from 1, which faces the main nave of the cathedral. These effectively divide the dome into quarters and never completely close in summer. There is a theory that the plaster used to patch the cracks over the years and crumbling building materials have jammed the fissures.
Type B. These sub-vertical minor cracks are located near the circular windows.
Type C. These are sub-vertical minor cracks that are present around the eight edges of the dome.
Type D. These are four sub-vertical minor cracks in the internal part of the odd webs. They do not pass through the width of the dome.
All have formed in a symmetrical pattern.
The development of the Type "A" cracks means that the dome now permanently behaves as four drifting half-arches linked below the upper oculus. The abutments of these half-arches are constituted by the pillars, the chapels and the nave of the church. The differences in the cracking patterns between even and odd webs is believed to be due to variations in the stiffness of the supporting ring beam structure under the dome as it is supported by four heavy pillars which line up with the even webs while the odd webs are located over four arches which connect the pillars.
In 1987 a second and more comprehensive digital system (which automatically collects data every six hours) was installed by ISMES (in cooperation with the "Soprintendenza", the local branch of the Ministry of Culture, which is responsible for the conservation of all historical monuments in Florence) in 1987. It consists of 166 instruments, among which are 60 thermometers measuring the masonry and air temperature at various locations, 72 inductive type displacement transducers (deformometers) at various levels on the main cracks of the inner and outer domes; eight plumb-lines at the centre of each web, which measure the relative displacements between pillars and tambour; eight livellometers and two piezometers, one near the web 4 and the other below the nave which register the variation of the underground water level. A linear regression analysis of the recorded data has shown that the major cracks are widening by approximately 3 mm (0.12 in) per century. Another source quotes a movement of 5.5mm.
Using software that had been used to model the structures of large dam a computer model of the dome was developed in 1980 in a collaboration between Italian National Agency for Electric Power and Structural and Hydraulic Research Centre (CRIS) by a group of researcher leaded by Michele Fanelli and Gabriella Giuseppetti in cooperation with the Department of Civil Engineering of the University of Florence, under the supervision of Andrea Chiarugi. Because of limited computational resources and for reasons of symmetry only a quarter of the dome was modelled. The resulting finite elements analysis confirmed that the main cracks was essentially being created by self-weight of the dome. Since then series of numerical models of increasing complexity have been developed. To assist in monitoring of the dome an extensive photogrammetric and topographical survey of the entire dome was commissioned in 1992 by the "Soprintendenza". The results of this survey were then used to further develop the finite elements model of the dome.
(Wikipedia)
Die Kathedrale Santa Maria del Fiore (italienisch Cattedrale metropolitana di Santa Maria del Fiore) in Florenz ist die Bischofskirche des Erzbistums Florenz und somit Metropolitankirche der Kirchenprovinz Florenz. Sie wurde von Papst Eugen IV. am 24. März 1436 geweiht und trägt den Titel einer Basilica minor. Das Kirchenschiff fasst circa 4.000–5.000 Personen. Ihre gewaltige Kuppel, das Hauptwerk Brunelleschis, gilt als technische Meisterleistung der frühen Renaissance.
Dimensionen
Der Florentiner Dom ist, bezogen auf die Länge des Längsschiffs, nach dem Petersdom im Vatikan, St Paul’s Cathedral in London und dem Mailänder Dom die viertgrößte Kirche in Europa (nach der bebauten Fläche rangiert allerdings noch die Kathedrale von Sevilla in Spanien an dritter Stelle). Seine Abmessungen: 153 m Länge, 38 m Breite, Breite des Kuppelfundaments 90 m. Die Seitenschiffe haben eine Gewölbehöhe von 23 m, das Mittelschiff ist um etwa 12 Meter höher. Die lichte Höhe der Kuppel beträgt vom Boden bis zur Laterne 90 m. Außen ist die Kuppel mit Laterne mehr als 114 m hoch.
Baugeschichte
Bis ins 13. Jahrhundert hatten den Bewohnern der Stadt das Baptisterium San Giovanni sowie einige kleine Kirchen zur Repräsentation genügt. Erst 1296 entschloss man sich zum Bau eines Doms nach Plänen von Arnolfo di Cambio. Der Bau sollte Ausmaße haben, wie sie die Toskana nie zuvor gesehen hatte. Der Entschluss kam nicht aus einem religiösen Impuls, sondern aus dem Wunsch nach einem weithin sichtbaren Monument, nicht zuletzt in Konkurrenz zu Venedig, Pisa und zum 1229 begonnenen Dombau in Siena.
Baubeginn
Noch im gleichen Jahre wurde mit der Errichtung der Westfassade begonnen. Die ursprüngliche Bischofskirche, Santa Reparata, wurde dabei zunächst von dem Neubau umgeben und weiter liturgisch genutzt. Nach dem Tod Arnolfos kamen die Arbeiten zum Erliegen, da die Ressourcen zum Bau der dritten Stadtmauer und zur Errichtung des Palazzo della Signoria genutzt wurden. Von der Fassade war nach Arnolfos Entwürfen bis dahin nur der untere Teil vollendet.
Der Campanile Giottos
Erst die spätere Berufung Giottos brachte neue Impulse. Doch Giotto, schon 68 Jahre alt, richtete seine ganze Energie auf den Campanile, der in kürzerer Zeit zu vollenden war. So wollte er Florenz wenigstens mit dem Campanile ein alles überragendes Wahrzeichen schenken.
Die Turmfundamente waren bereits 1298 zu Beginn der Bauarbeiten an der neuen Kathedrale unter Arnolfo di Cambio gelegt worden. Die für die italienische Gotik ungewöhnliche Position des Glockenturms – in einer Linie mit der Westfassade – wird zum einen als Indiz für die besondere Betonung der Vertikalen als Zentrum der Bischöflichen Insel gewertet, andererseits wollte man die Sichtachse auf die geplante große Kuppel freihalten.
Giotto di Bondone entwarf einen Campanile, der eine pyramidenförmige Spitze mit einer Höhe von 50 florentinischen Braccia (Armlängen), also etwa 30 Metern gehabt hätte; insgesamt wäre er 110–115 Meter hoch geworden. Bei Giottos Tod im Jahr 1337 war erst das erste Geschoss fertiggestellt. Andrea Pisano und Francesco Talenti beendeten den Bau 1359 mit einigen Änderungen. Der Turm bekam ein niedriges Pyramidendach und wurde nur 85 m hoch.
Im Turm sind insgesamt zwölf Kirchenglocken untergebracht. Eine Glocke befindet sich abgestellt auf dem Boden des Glockengeschosses. Sie ist die 1516 von Lodovico di Guglielmo gegossene 2500 Kilogramm schwere Apostolica. Zudem hängen auf allen vier Seiten, jeweils zwischen Glockenstube und Fenster vier kleinere Glocken (Beona, Maria Anna, Campana Piccola, Campana Più Piccola), die nicht geläutet werden können. Die übrigen sieben Glocken bilden das Hauptgeläut, das seit 2000/2001 über einen neuen elektrischen Läuteantrieb verfügt.
Wiederaufnahme der Bauarbeiten am Dom
Ab 1330 übernahm die Wollweberzunft die Verantwortung für den Dombau. Neue Baumeister modifizierten die Pläne immer wieder, bis sie 1368 gebilligt und das danach entstandene Ziegelmodell (Maßstab 1:10) für verbindlich erklärt wurden. Der Bau konnte nun schneller vorangetrieben werden. Schon 1379 wurde das Langhaus für den Gottesdienst in Gebrauch genommen.
Fassade
Die unter Arnolfo di Cambio begonnene Fassade wurde schon 1588 als unzeitgemäß empfunden und abgerissen, um Platz für eine neue Fassadengestaltung zu schaffen, für die die Mittel dann allerdings nicht ausreichten. Die heutige Westfassade ist eine neogotische Vervollständigung des späten 19. Jahrhunderts, die den Stil des Langhauses, die Gestaltung in dreifarbigem Marmor, fortsetzt. Sie wurde nach Entwürfen von Emilio de Fabris und Guglielmo Calderini (Obergeschoss) bis 1887 vollendet.
Kuppel
Brunelleschis Kuppel
1417 legte Brunelleschi sein erstes Kuppelmodell vor, nachdem vorher beschlossen worden war, eine noch prächtigere und größere Kuppel zu erstellen, als das erste Modell vorgesehen hatte. Der Bau der 107 Meter hohen Kuppel mit einem Durchmesser von 45 Metern dauerte 16 Jahre (1418 bis 1434). Von Anfang an trug die aus zwei Schalen bestehende Konstruktion sich selbst und wurde ohne Lehrgerüst errichtet. Aufgrund ihrer Einzigartigkeit wird sie noch heute als Höhepunkt der Renaissance gesehen. Der Dom wurde nach der Fertigstellung der Kuppel am 25. März 1436 in Anwesenheit von Donatello, Brunelleschi, Ghiberti, Michelozzo und Alberti durch Papst Eugen IV. geweiht. Für die Ausführung der Glasfenster wurde 1436 der Glasmaler Francesco Livi aus Lübeck nach Florenz berufen. Die Laterne wurde nach einem Entwurf Brunelleschis von 1446 bis 1461, zuletzt unter der Aufsicht von Michelozzo, erbaut. Bis zum Ende des 16. Jahrhunderts gab es immer wieder kleinere Arbeiten am Dom.
Ausmalung der Kuppel
Die Innenbemalung der Kuppel war nach früherer einhelliger Meinung der Kunsthistoriker missglückt. Kein Geringerer als Giorgio Vasari, der Vater der Kunstgeschichtsschreibung und der Schöpfer des gleichnamigen Korridors über den Ponte Vecchio, hatte 1572 dieses Fresko begonnen, das 1579 von Federico Zuccari vollendet wurde. Es ist in seinen Ausmaßen riesig und gilt nach der Fläche als der größte Fresken-Zyklus zu einem christlichen Thema. Hunderte von Kolossalfiguren gruppieren sich auf insgesamt 4000 m² um den Weltenrichter, den man in der unteren Mitte mühsam erkennen kann. Vasaris Traum soll es gewesen sein, Michelangelos Jüngstes Gericht in der Sixtinischen Kapelle zu übertreffen.
Das Riesenwerk ist nicht unproblematisch. Denn es ist so weit vom Boden entfernt, dass man kaum ein Detail hinreichend erkennen kann – der Kuppelraum ist normalerweise dunkler als auf den Fotos –, und vor allem: Das Fresko Vasaris lässt die Kuppel nicht höher erscheinen, sondern niedriger. Das Kuppelfresko wurde seit 1979 restauriert und ist 1994 wieder enthüllt worden, wobei die beiden Kunsthistorikerinnen Cristina Acidini und Cristina Danti bisher ungewürdigte künstlerische Qualitäten dokumentiert haben.
Vasari war schon krank, als er 1572 im Alter von 61 Jahren das Gerüst zur Ausmalung der Kuppel bestieg und starb bereits zwei Jahre danach 1574 lange vor der Vollendung des Freskos. Federico Zuccari übermalte und modernisierte teilweise Vasaris Malerei. Dabei unterliefen ihm auch einige Fehler. So bekam beispielsweise ein Esel die massigen Beine eines Bären, der seinerseits mit Hufen ausgestattet wurde, was vom Boden der Kathedrale aus jedoch nicht sichtbar ist.
Einzelne Aspekte zum Florentiner Kuppelbau
Vorgeschichte
Die Kuppel des Domes von Florenz ist nicht die Bekrönung der Vierung eines lateinischen Kreuzes, also einer Kreuzung von Langhaus und Querhaus, sondern einer Drei-Konchen-Anlage, somit also ein Zentralbau, der erste der Renaissance. Zumindest hieß es so lange Zeit in der Fachliteratur. Aber dieser Zentralbau ist eine Idee der Gotik und seine Durchführung wurde mit gotischen Mitteln erreicht. Man sagt also besser: Dieser gotische Plan kam den Tendenzen der Renaissance entgegen.
Die Bewunderung für das antike römische Pantheon und die architektonische Tradition hatten sich vereint, um die Kuppel zum idealen und zentralen Bestandteil der Kirche zu machen. Es scheint, dass man auch in jenen Fällen, in denen man keinen Zentralbau durchführen konnte, weil – wie hier am Florentiner Dom – ein Langhaus bereits vorgegeben war, sich als Ersatz dafür im Ostbau wenigstens die Illusion eines Zentralbaus mit der Kuppel als wichtigstem Bestandteil hat verschaffen wollen.
Dabei gab es eine prinzipielle Schwierigkeit in der Renaissance bei der Verbindung des Zentralbauideals mit rein liturgischen Erfordernissen. Sollte ein Zentralbau eine Kuppel erhalten, dann konnte er nicht allzu groß werden, weil die Konstruktion der Kuppel das schwierigste von allem war. Deshalb wurde das Ideal des reinen Zentralbaus meistens bei kleineren Kirchen erfüllt.
In großen Kirchen sollten aber auch viele Menschen zusammenkommen, und das widersprach den technischen Grenzen des Zentralbaus. Deshalb wurden häufig Kompromisse gebildet, indem man an einen zentralbauähnlichen Ostteil ein Langhaus anschloss. Jetzt konnten zwar viele Gläubige im Innenraum zusammengefasst werden, aber ein idealer Zentralbau war das nicht, wie man am Grundriss sehen kann.
Besonders dramatisch waren später diese Auseinandersetzungen beim Neubau von St. Peter in Rom. Auch hier siegte im Endeffekt die politische Wirkung eines solchen bedeutenden Baues über das architektonische Ideal Michelangelos. Und die Politik spielte auch hier in Florenz eine Rolle.
Die Kuppel als Träger der Staatsidee
Von jeher war Architektur in den italienischen Stadtstaaten dazu ausersehen, Träger der Staatsideen zu werden. Und die Kuppel des Florentiner Doms hier war der deutlich sichtbare Ausdruck eines neuen Machtanspruchs einer Stadt, die mit 50.000 Einwohnern so viele Bewohner hatte wie London. Durch Brunelleschi wurde die Kuppel zu einer neuen Pathosformel erhoben – und das merkt man bis hin zum Kapitol in Washington von 1857. Im Mittelalter war der Turm oder die Turmgruppe das höchste architektonische Zeichen städtischer Majestät. Jetzt in der Neuzeit, in der Renaissance, wurde die Kuppel das Symbol staatlicher Macht.
Hier spielt sicher auch eine Rolle, dass zur damaligen Zeit Florenz mit Kunstwerken deutlich weniger ausgestattet war als seine italienischen Konkurrenten. Nach den Zeiten der Protorenaissance im 11. Jahrhundert gab es seltsamerweise eine lange Pause in der Entwicklung der Kunst. Erst 1246 mit der Dominikanerkirche Santa Maria Novella wurde wieder eine neue Periode in der Kunstgeschichte der Stadt eröffnet.
Im ganzen 12. Jahrhundert und noch im frühen 13. Jahrhundert, als in Pisa bereits der Dom erweitert wurde, der Campanile, das Baptisterium und der Camposanto erbaut wurden, als man in Lucca, in Pistoia, in Prato und später auch in Arezzo und Siena Dome und Kirchen errichtete, entstand in Florenz kein Bauwerk gleichen Ranges. Während sich Pisa und Lucca zu Zentren der Bildhauerkunst und der Malerei entfalteten, ist für Florenz kaum eine Skulptur und kein Gemälde bezeugt. In dieser fast 150 Jahre dauernden Pause schuf Florenz stattdessen die wirtschaftlichen und politischen Voraussetzungen für seine spätere Vormachtstellung, die dann durch den Bau des Domes und vor allem durch die dominierende Kuppel neuen, majestätischen Ausdruck erhalten sollte. Also: Die Kuppel des Doms hatte für Florenz wortwörtlich überragende Bedeutung. Hier musste mit einem Schlag ein langer künstlerischer Rückstand übersprungen werden. Florenz hatte gleichsam keine Wahl. Die Kuppel musste gelingen.
Das Interessante daran ist, dass möglicherweise bereits Arnolfo di Cambio, der 1296 mit dem Bau begonnen hatte, eine solche Kuppel vorgesehen hatte. Inspiriert war diese Idee sicher damals schon vom Baptisterium und von den gigantischen Kuppelbauten der römischen Antike, vor allem auch hier vom Pantheon in Rom und von der Hagia Sophia in Byzanz. Als weiteres Vorbild darf sicher die Kuppel des Pisaner Domes angenommen werden und die des Doms von Siena, einer Stadt, zu der Florenz in besonderer Konkurrenz stand. Aber die Verbindung dieser Idee einer so gigantischen Kuppel mit einem gotischen Langhaus war neu.
Die Probleme eines Kuppelbaus
Der Plan zu einer riesigen Kuppel war auch 1367 vorherrschend, als nach langer Bauunterbrechung eine Kommission der Baumeister und Maler die Ausdehnung der Vierung selbstbewusst auf 42 Meter erhöhte und eine Gewölbehöhe der noch zu bauenden Kuppel von 83 Metern vorsah] Damit sollte die Florentiner Kuppel nicht nur die breiteste, sondern auch die höchste jemals errichtete Kuppel werden. Man hatte dabei sicher das Pantheon in Rom vor Augen, dessen Kuppeldurchmesser 42,70 Meter beträgt, also fast identisch mit den Florentiner Plänen.
Die aus diesen gewaltigen Ausmaßen resultierenden Schwierigkeiten erkannte man erst später. Denn man wusste nicht, wie man ein solch riesiges Gewölbe von 42 Metern Durchmesser über dem achteckigen Grundriss errichten konnte. Es erwies sich nämlich beispielsweise als unmöglich, die Gerüstbalken zu beschaffen, die für den Bau einer solchen Wölbung benötigt wurden. Denn man war zuvor – 1410–1413 – auf die kühne Idee gekommen, auf das 42 Meter hohe oktogonale Grundgeschoss noch ein Tambourgeschoß von knapp zehn Metern Höhe und 4½ Metern Dicke aufzusetzen, so dass die Kuppel erst in der unglaublichen Höhe von 52 Metern ansetzte, also in einer Höhe, die über den höchsten Gewölben der französischen gotischen Kathedralen lag – das höchste gotische Gewölbe hat die Kathedrale von Beauvais mit 48 Metern.
Übrigens erhielt die Kirche erst jetzt ihren heutigen Namen Santa Maria del Fiore. Bis dahin hieß sie wie die Vorgängerkirche Santa Reparata.
Und damit niemand auf die Idee kam, diesen neuen, kühnen Plan von 1367 zugunsten älterer, einfacherer Lösungen zu verlassen und damit den neuen Machtanspruch von Florenz zu reduzieren, vernichtete man alle älteren Dokumente, die sich mit dem Dombau befassten. Man hat also gleichsam alle Brücken hinter sich abgebrochen. Entweder diese neue Kuppel mit bisher noch nie erreichter Höhe – oder gar keine. Daher ist nur unzulänglich bekannt, wie sich Arnolfo di Cambio und seine frühen Nachfolger den Dom eigentlich vorgestellt hatten.
Die Konkurrenzsituation
Damals, in der 2. Hälfte des 14. Jahrhunderts herrschte eine scharfe Konkurrenz zwischen den großen norditalienischen Städten in Bezug auf ihre zentralen großen Kirchenbauten. In Florenz wurden teilweise über acht Prozent der gesamten Staatseinkünfte für den Bau des Domes aufgewandt.
1388 wurde in Bologna der Dom San Petronio begonnen, der den im Bau befindlichen Florentiner Dom noch übertreffen sollte, aber nie vollendet wurde. Zwei Jahre zuvor, 1386, war der Mailänder Dom begonnen worden, der nicht nur die italienischen, sondern alle Kathedralen des Abendlandes übertreffen sollte – allerdings ohne große Türme und ohne Kuppel. Die Kuppelwölbung war das große Problem und sie blieb es bis in unsere Zeit hinein, daher auch ihre große Bedeutung für die Repräsentation. Noch in der Nikolaikirche in Potsdam in der Mitte des 19. Jahrhunderts, im Kapitol von Washington 1857 und in den Großmacht-Fantasien des NS-Architekten Albert Speer für das Neue Berlin der 40er Jahre des 20. Jahrhunderts wirkte diese Idee nach.
1414 war in Florenz der Bau wieder ins Stocken geraten. Als vorerst letztes Glied wurde der zehn Meter hohe achteckige Tambour mit seinen runden Lichtöffnungen von 3,5 Meter Durchmesser errichtet. Die oktogonale Basis als Auflager für die Dachkonstruktion war damit vorgegeben.
Der Wettbewerb
Das Problem wurde über einen Wettbewerb im Jahr 1418 gelöst. Man schrieb am 19. August einen Wettbewerb aus, den Brunelleschi nach diversen Widerständen mit einem Rohentwurf gewann.
Die revolutionäre Idee Brunelleschis bestand darin, das Baugerüst gar nicht auf dem Boden aufsetzen zu lassen, sondern als Klettergerüst innerhalb der noch zu bauenden Kuppel zu verankern. Die Gutachterkommission lehnte seinen Vorschlag zunächst mehrmals ab. Brunelleschi bestand aber auf seinem Plan, teilweise so beharrlich, dass man ihn mehrmals aus den Sitzungen der Gutachterkommission hinaustragen musste. Außerdem war Brunelleschi nicht bei einem Baumeister in die Lehre gegangen, sondern bei einem Goldschmied, gehörte also nicht zur Gilde der Steinmetze, sondern derjenigen der Seidenweber an, die sich mit den Goldschmieden zusammengeschlossen hatten.
Erst als auf Seiten der Stadt keine brauchbare Alternative zu Brunelleschis Plan gefunden wurde, ließ man sich doch auf dessen Idee ein. Brunelleschi wurde nach der Annahme seines Rohentwurfes gebeten, einen genauen Plan auszuarbeiten. Ihm wurde zwar die Bauleitung übertragen, aber als unerfahrenem Baumeister wurde ihm – zur Vorsicht – Lorenzo Ghiberti an die Seite gestellt, was ihn sehr geärgert haben muss. Beide sollen sich zeitlebens wenig verstanden haben, nachdem 1401 Brunelleschi im Wettbewerb um die zweite Bronzetür des Baptisteriums Ghiberti unterlegen war. Trotzdem arbeiteten sie 18 Jahre lang an der Kuppel des Florentiner Domes zusammen, anfangs mit gleichem Gehalt. Um Ghibertis Inkompetenz bloßzustellen, soll Brunelleschi eine Krankheit fingiert haben, deretwegen die Bauarbeiten ins Stocken kamen.
Der Baubeginn der Kuppel
Der Baubeginn der Kuppel fand am 7. August 1420 in 52 Metern Höhe statt. Im gleichen Jahr war Brunelleschi mit einer weiteren genialen Idee aufgetreten. Er übernahm ein Bauprinzip aus der nordeuropäischen Gotik, die Rippenwölbung. Er verlegte Rippen an jeder Ecke des Oktogons und jeweils zwei zusätzliche im Innern jeder Gewölbekappe, also insgesamt 24, die miteinander durch waagerechte Querbalken verbunden waren. Die äußeren sind die weithin sichtbaren acht großen Marmorrippen mit einem Maß von 4,4 × 3,5 Metern. Jedes der acht Segmente der Kuppelschale ist an seiner Basis 17 Meter breit, 3,50 Meter dick und vollwandig aus massivem Kalksandstein geschichtet.
Durch diese insgesamt 24 Rippen entstand ein Skelettsystem, das mit zwei Ziegelschalen, einer inneren und einer äußeren, ausgefugt wurde. Die Schalen aus Ziegeln wurden in einzelnen Ringen von unten nach oben aufgemauert; die Kuppel wurde ohne Lehrgerüst errichtet. Das Deckenloch wurde zuerst wie im Pantheon in Rom offen gelassen. Später wurde die Laterne aufgesetzt.
Um einen Begriff davon zu bekommen, um welche Dimensionen an Hölzern es sich hier handelte: Für die Halbkuppel der südlichen Apsis, die im Jahr 1418 mit einem solchen Lehrgerüst konstruiert wurde, benötigte man 32 Baumstämme, die in Bohlen von insgesamt 280 Metern Länge und 135 Balken zersägt wurden. Die Halbkuppel ist aber weitaus kleiner im Vergleich zur Vierungskuppel, für die nach einer Schätzung zwanzig Mal so viel Holz benötigt wurde.
Das waren bis dahin kaum vorstellbare und schwerlich finanzierbare Dimensionen, und auch die technische Realisierbarkeit blieb weiterhin fraglich. Brunelleschi, der sich in antiker Architektur auskannte, nahm die alte Idee der Doppelschaligkeit auf und erfand ganz neue Techniken für die einzelnen Arbeitsschritte.
Zugringe aus Stein
Eine doppelschalige Kuppelkonstruktion entsprach der antiken Tradition. Auch das Baptisterium besitzt in Ansätzen eine solche doppelte Schale. Die Idee stammt aus dem mittelalterlichen Persien und stellte das typische Merkmal islamischer Moscheen dar. Trotz der Doppelschaligkeit blieben bauliche Schwierigkeiten.
Die Kuppel musste – auch als Rippenkonstruktion – zusätzlich abgestützt werden, genauso wie in der gotischen Architektur Nordeuropas, wo diese Idee herkam. Aber in Italien gibt es außer beim Mailänder Dom kein äußeres, stützendes Strebewerk wie in Frankreich oder Deutschland. Die riesige Kuppel in Florenz kann seitlich nicht abgestützt werden, da sie in zu großer Höhe thront. Um den horizontalen Schub des Gewölbes zu neutralisieren und nur noch Vertikalkräfte in die Tambourwände einzuleiten, erfand Brunelleschi „ein System so genannter Steinketten, um die beiden Gewölbeschalen zusammenzuhalten. Sie setzen an den Rippen an und sind durch Metallklammern verbunden, so dass sie Zugspannung aufnehmen können. Ohne sie würden die Rippen unter der Gesteinslast nach außen gedrückt“ und bersten.
Die Kuppel: Gotik oder Renaissance?
Die Kuppelkonstruktion hatte nachhaltige Konsequenzen für die Architektur der gesamten Renaissance. Deswegen setzte die Kunstgeschichte den Beginn der Renaissance lange Zeit auf diesen Kuppelbau von 1420 bis 1436.
Gegen diese Sichtweise ist aber einiges einzuwenden. Die Kuppel war unzweifelhaft eine Glanzleistung, die von niemandem übertroffen worden ist, auch nicht von Michelangelo später am Petersdom in Rom. Aber in diesem Fall war Brunelleschi in erster Linie als Ingenieur gefordert, die in der Planung bereits festgelegte Vierungskuppel zu erbauen. „Das ganze Werk hat bezeichnenderweise ein spitzbogiges, gotisches Profil, denn es ist nach dem gotischen Prinzip der tragenden Rippen erbaut. Selbst wenn Brunelleschi die Kuppel des Pantheon studiert hat, um seine Technik zu vervollkommnen, haben die beiden Werke doch nichts miteinander gemein: die Kuppel des Pantheon ist eine echte Halbkugel, […], die von den riesigen Mauern getragen wird. […] Die Florentiner Kuppel ist ein ins Gigantische gesteigertes Spitzbogengewölbe, das als Kuppel getarnt ist. Nur in den untergeordneten Bauelementen erscheint der Stil Brunelleschis – und damit Renaissancekunst.“ Auch das Motiv des Kapellenkranzes, der sich um die Vierung herumlegt, kommt aus der nordeuropäischen Architektur, ist also Gotik (oder sogar Romanik) und keine Renaissance.
Das erste wirkliche Renaissance-Bauwerk Brunelleschis ist die nicht weit entfernte Kirche von San Lorenzo.
Es ist wahrscheinlich nicht so, dass sich Brunelleschi von Anfang an über alle Details der Konstruktion im Klaren war. Auf viele Ideen kam er erst während der 16-jährigen Bauzeit. Und der obere spätere Teil der Kuppel war der schwierigere, weil hier die Wölbung wesentlich stärker ist. Genaue Informationen über Brunelleschis Pläne und Phantasien sind nicht bekannt, weil er in dieser Hinsicht schweigsam war. Er befürchtete, dass andere ihm seine Ideen stehlen könnten. Deshalb informierte er nur seine nächsten Mitarbeiter über seine Pläne – und das auch nur spät. Brunelleschi ist in Sichtweite des Domes aufgewachsen, kannte von Kindesbeinen an die Probleme, die seine Vorgänger mit der Wölbung hatten, informierte sich jahrelang auch in Rom über antike Architektur und hatte mit Sicherheit diverse Pläne im Kopf, wie eine solche Kuppel zu konstruieren sei. Aber er wusste, dass er der einzige war, der so etwas konnte, und behielt sein Wissen möglichst bei sich. Wenn er für sich selbst Pläne aufzeichnete, bediente er sich einer Geheimschrift, die niemand anderer lesen konnte.
Eisenkette
So gibt es beispielsweise seit ewigen Zeiten Gerüchte über eine Eisenkette, die Brunelleschi angeblich zusätzlich zu den bekannten Steinketten um den Sockel der Kuppel hat legen lassen. Eine magnetische Untersuchung, die in den 1970er Jahren durchgeführt wurde, erbrachte keinen Beweis, dass diese Ketten tatsächlich existieren.
Holzkette
Was es aber außer den vier Steinketten wirklich gibt, ist eine 1424 hinzugefügte Holzkette 7½ Meter über der untersten Steinkette – bestehend aus Balken aus Kastanienholz von sechs Metern Länge und einem Querschnitt von 30 × 30 Zentimetern. Dieses Holz musste gefunden und sorgfältig mit einem speziellen Verfahren verarbeitet werden, was mehrere Jahre in Anspruch nahm. Dass man außer an Stein- auch an Holzketten dachte, hat damit zu tun, dass man eine solche Holzkonstruktion für widerstandsfähiger bei Erdbeben hielt. Bei der Hagia Sophia in Konstantinopel war man so vorgegangen und bei einigen anderen Bauten in den gefährdeten Gebieten beispielsweise in Persien. Und tatsächlich erlitt die cupola bei den Erdbeben von 1510, 1675 und 1895 keine Schäden. Die Holzkette musste übrigens im 18. Jahrhundert ausgetauscht werden, weil das Holz zu verrotten begann.
Baumaschinen
Zu Brunelleschis Glanzleistungen zählen unter anderem auch die Maschinen, die er entworfen hat, um mit ihnen die Steine in die Höhe zu ziehen. Hier waren Konstruktionen notwendig, die zur damaligen Zeit noch nicht existierten. Die Materialaufzüge und Kräne, die Filippo entwarf, wurden zu den meistbewunderten mechanischen Geräten der Renaissance. Das Seil für den Lastenaufzug wurde in Pisa bestellt, einer Hochburg des Schiffbaus. Aber auch die dortigen Fachleute sahen sich einer neuen Aufgabe gegenüber, denn es wurde das längste und schwerste Seil benötigt, das jemals angefertigt worden war: 180 Meter lang, mehr als sieben Zentimeter dick und mit einem Gewicht von nahezu einer halben Tonne. Dieser Aufzug bewegte täglich ca. 50 Mal die Steine in die Höhe, also ungefähr eine Fuhre alle zehn Minuten.
Bevor die einzelnen Steine in der Kuppel eingesetzt wurden, mussten sie natürlich genau zugehauen werden. Die Schablonen dafür wurden auf einem Grundstück hergestellt, das Brunelleschi im Sommer 1420 flussabwärts auf einem Uferbereich des Arno auf einer Fläche von 800 m² präpariert hatte. Dort wurde ein Plan der Kuppel im Verhältnis 1:1 in den Sand geritzt. Bei den gotischen Kathedralen Nordeuropas war man ähnlich vorgegangen. Diese Schablonen von über 2½ Metern Größe wurden anschließend am Mauerwerk der inneren Kuppelschale befestigt und dienten als Richtmaß.
Ziegel
Bei der Herstellung der Ziegel ging man ebenfalls von Schablonen aus, da nicht nur einheitliche Maße benutzt wurden, sondern auch außergewöhnliche – dreieckige Formen, Ziegel mit Verzahnungen oder mit hervorstehendem Rand, Ziegel, die genau in die Ecken passten etc. Aber bis es überhaupt so weit war, musste ein langer Weg zurückgelegt werden.
Die Brennöfen befanden sich nicht in der Stadt, sondern auf dem Land in der Nähe der Tongruben. Es war natürlich etwas anderes, ob man Ziegel brauchte für ein kleines Haus, die man im Bedarfsfalle leicht ersetzen konnte, oder ob es sich um Ziegel handelte für die Riesenkuppel von Florenz, wo ein kleiner Fehler massive Konsequenzen haben könnte. Jedenfalls gab es umfangreiche Regeln dafür, wie und wo und wann der Ton gewonnen werden sollte, wie lange er vor dem Brennen trocknen sollte – das konnte bis zu zwei Jahren dauern –, wie der Mörtel beschaffen sein sollte usw.
Der geknetete Ton wurde in entsprechenden Holzformen an der Luft getrocknet und vorgehärtet. Danach erfolgte das Brennen, das mehrere Tage dauerte. Da die Temperatur im Ofen um 1000 Grad Celsius betrug, ließ man die Ziegel zwei Wochen abkühlen, damit sie bruchfester wurden, bevor man sie zur Baustelle transportierte. Ein Brennofen konnte im Durchschnitt 20.000 Ziegel aufnehmen; wurde er alle drei Wochen befeuert, ergab dies eine jährliche Kapazität von mehr als 300.000 Ziegeln. Doch selbst bei dieser Leistung hätte es mit nur einem Brennofen mehr als 13 Jahre gedauert, die für den Bau der Kuppel erforderlichen vier Millionen Ziegel herzustellen.
Das Tempo der acht Maurermannschaften wurde durch das Abbinden des Mörtels im zuletzt gemauerten Horizontalring auf weniger als einen Ring pro Woche begrenzt. Die Kuppel wuchs somit jeden Monat um ungefähr 30 Zentimeter in die Höhe.
Trotz der schwierigen Arbeitsbedingungen soll während der 16-jährigen Bauzeit der Kuppel nur ein einziger Arbeiter ums Leben gekommen sein.
Loggia
Am Ansatz der Kuppel wurde 1508–12 versucht, eine Loggia anzubringen, die den gesamten Ostbau plastisch aufgelockert hätte und die auch zu Brunelleschis Plan gehörte. Aber deren Gestaltung ist zu zierlich geraten und – der Überlieferung nach – soll Michelangelo sich sehr abschätzig über diese Idee geäußert haben – sie sehe aus „wie ein Grillenkäfig“ –, weshalb der Plan nicht vollendet wurde.Quelle?
Risse
Insgesamt wiegt allein die Kuppel ca. 37.000 Tonnen und hat bis heute gehalten, trotz der insgesamt 1.500 Haarrisse, die mittlerweile aufgetreten sind. Das Phänomen der Risse ist an sich nicht neu. Angeblich sollen schon um 1500, also kurz nach Fertigstellung des Bauwerks, solche Risse aufgetreten sein. Jetzt scheinen die Risse so zahlreich zu werden, dass man überlegt, Maßnahmen zu ihrer Beseitigung zu ergreifen.
Man weiß nicht, wie Brunelleschi selber dieses Problem gesehen hat, denn er hat keinerlei Aufzeichnungen hinterlassen. Michelangelo hat bei der Konstruktion der Kuppel des Petersdomes in Rom eine schwere Eisenkette um deren Sockelzone vorgesehen. Als Grund für die jetzt zunehmend auftretenden Risse in Florenz werden von fachlicher Seite die normalen Temperaturschwankungen angegeben, die im Laufe der Jahrhunderte dem Mauerwerk langsam zugesetzt hätten. Eine Lösung des Problems ist trotz zahlreicher Kommissionen offenbar noch nicht in Sicht, deren erste bereits 1934 angetreten war. Aktuell wird die Kuppel durch ständiges Deformationsmonitoring überwacht, um kleinste Veränderungen sofort nachvollziehen zu können.
Andererseits gilt: „Da in der Regel schon beim Ausschalen des Gewölbes solche Spannungen auftreten und erste Risse provozieren, ist der gerissene Zustand als der normale anzusehen und das jeweilige Rißbild im Gewölbe Zeichen einer letztlich individuellen Statik.“
Treppensystem
Brunelleschi baute die Kuppel auf einem hohen Tambour in den besagten zwei Schalen, wobei die innere Schale die dickere ist. Die äußere dient lediglich der Bedachung. Zwischen beiden Schalen liegt ein Treppensystem, das über 463 Stufen begehbar ist und auf die Laterne an der Kuppelspitze in 106 Meter Höhe führt.
Nachwirkungen des Florentiner Kuppelbaus
Dieser gewaltige Kirchenbau, dessen Konzeption bereits 1367 festgelegt war, sollte Ausdruck des Stolzes einer Stadt sein, die damals ein außerordentliches Maß an Macht und Reichtum erworben hatte. Florenz zählte gegen Ende des 13. Jahrhunderts mit ungefähr 100.000 Einwohnern zu den größten Städten der damaligen Welt.
Von vergleichbarer Größe ist die ebenfalls doppelschalige Kuppel des Petersdoms (1590) mit 42,3 Metern Durchmesser, das größte freitragende Ziegelbauwerk der Erde, und das Pantheon (118) mit der größten in unbewehrtem Beton gegossenen Kuppel von 43,2 Metern, beide in Rom. Einen größeren Durchmesser hatte mit 108 Metern erst die zur Weltausstellung 1873 gebaute Rotunde in Wien aus Stahl, die 1937 einem Brand zum Opfer fiel.
(Wikipedia)