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NPS/Patrick Myers
How did Great Sand Dunes become the tallest dunes in North America?
It's actually somewhat common in the western U.S. for sand to blow from arid valley floors and form dunes in pockets of mountain ranges. However, the San Luis Valley is vast, and a large part of it is a closed basin where water has pooled for thousands of years, leaving extensive sand deposits behind.
When sand arrives in this low curve of the Sangre de Cristo Mountains, it starts to be subject to opposing mountain storm winds. This battle between winds from the southwest and the northeast causes the dunes to grow vertically, stacking dune ridge upon dune ridge.
For scale, look closely to see four hikers near the top center of this photo. These dunes are taller than most city skyscraper buildings!
After seeing on article on ciao_chao's blog (Illucisco Photography) we've been trying our hand at reversing lenses for macro photography. This was taken with a 50mm prime on a f/4 aperture.
زوج جوان، نقاشی پشت شیشه ای معکوس، سده ۱۹ ترسایی، ۳۵ در ۳۹.۵ سانتیمتر
Reverse glass paintings: a Persian maiden and an officer with a Persian maiden, Persia,19th century
glass painted in reverse, rectangular painting with an officer and maiden painted with gold ornamental details, in a wooden frame painted with polychrome floral borders, old collector's numbers written to reverse
39.5 by 35cm.
614I 0830 Lichfield Tv C E Sidings to Severn Tunnel Junction ,passes by with some workers filming on the I Phone in the back.
Oval Beach, Saugatuck Harbor Natural Area, Saugatuck, Michigan.
Olympus E-PL1 (full spectrum) + 590nm filter. Conversion to B&W with Nik Silver Efex.
American Avocet AMAV (Recurvirostra Americana)
female (by extent of curve)
a slough near
Pakowki Lake
Alberta
i was not aware how much toe webbing the AMAV can have.(Something which neither Sibley’s nor Stokes seem to indicate as far as i could see :)
Click on image to enlarge for more detailed view
L'ingegneria inversa (spesso si usa il termine inglese reverse engineering) è il processo di prendere qualcosa (un dispositivo, un componente elettrico, un programma software, ecc.) e analizzarne in dettaglio il funzionamento, solitamente con l'intenzione di costruire un nuovo dispositivo o programma che faccia la stessa cosa senza in realtà copiare niente dall'originale; ovvero realizzare un secondo dispositivo, componente o programma in grado di interfacciarsi con il primo [1].
É il processo di analisi di un sistema software esistente per creare una sua rappresentazione ad alto livello di astrazione.
In senso stretto l'attività di ingegneria inversa consiste nella comprensione del funzionamento e della realizzazione di un dispositivo fisico o virtuale al fine di produrre il nuovo dispositivo, mentre il termine reingegnerizzazione comprende entrambe le attività , ovvero quella di analisi e quella di ridisegno.
Solvations of some puzzles from the 2020 reverse engineering challenge, organised by Ryan Howerter on Instagram.
I found 2 solutions for this one, and neither is perfect. They both use 6 inverted tiles (with studs on the bottom) and 4 square road signs with a clip on the back.
In this one, the haed & tail tiles are held together by 4 bars 4L. The road sign clips are attached between the bars. The other inverted tiles are attached using 1/4 round tiles.
It's not very sturdy. Well, very fiddly. And the road signs are sitting really tight, which makes them 'dive' to the centre and drags the tiles slanted. As you can see bottom left. Bah.
My LGMS reverse loop module!
I started work on this massive undertaking back in early 2020, and it was finally completed in July of 2021. My intention was for it to showcase the full potential of this LGMS module type in order to promote its adoption. It features a rural landscape with a massive forested hillside, crop fields, a lake, a farmhouse, a small town main street, a grain elevator and feed mill served by the railroad, and a small Catholic church based on one I attend in real life! I couldn't be happier with how it turned out!
Sony a290, lente Minolta 70-210mm, Seagull-610 1.8 50mm invertido, Sam 18-55mm, anillo mas 2 lupas, todo esto para realizar mis fotografÃas macro.
Day 3
When I see this photo I realize that my yesterday's photo isn't bad hahaha.
But you know, I'm starting to like the photo haha.
Taken with a 24mm reversed onto extension tubes. Flash is on a hinged hot shoe and leaned out over the end of the lens stack. A DIY snoot fires the light in front of the lens.
Get your Free, No Hassle Reverse Mortgage. When using this image please provide photo credit (link) to: reverse.mortgage
This auto bridge and bend it a railroad bridge cross the Reversing Falls on the Saint John River. The rapids are influenced by the experienced by the Bay of Fundy. The city of Saint John is in the background.
Photographed using a Nikkor 35mm f/1.4 lens on a Sony A7R.
Reverse Mortgage Written on Chalk Board
When using this image please provide photo credit (link) to: www.aag.com per these terms: www.aag.com/retirement-reverse-mortgage-pictures
Still exploring the Queen's Park area of University of Toronto's campus and the former McLaughlin Planetarium surroundings, I came across a long 53-foot semi-truck needing to reverse out from a loading area through a narrow and winding side-road.
One can imagine to reverse a long semi-lorry is so easy task, never mind on a narrow and winding roadway. The tractor had to get on the curb in the final reverse-turn.
(See last image in the series)
Alas! That led to a complication. The drive axle became hung and airborne and could not provide traction. The tractor became stuck for 10 minutes before a solution was found.
Raging fires in Orange County, California provided a front-row, terminal view when take offs and landings @ John Wayne Airport in Southern California were reversed to avoid smoke-filled skies.