Rivulet Erosion formed these features at the Cannonball Mystery location in Theodore Roosevelt National Park, North Unit, North Dakota, USA

Parents analyze structure and function in objects from nature during interactive keynote STEM workshop for parents conducted by Dr. Diana Wehrell-Grabowski.

Intricate boxwork in Wind Cave, a cave formation found here more than anywhere else, Wind Cave National Park, South Dakota, USA

Navajo Sandstone shaped like cauliflower, cracked into polygons, at White Pocket, Vermilion Cliffs National Monument, Arizona, USA

Saguaro

Navajo Sandstone shaped like cauliflower, cracked into polygons, at White Pocket, Vermilion Cliffs National Monument, Arizona, USA

Best seen on black: press L to view.

Better in the original size!

Pinus ponderosa, the Real Deal.

Closeup of spectacular ice formations of Eben Ice Caves, Rock River Canyon Wilderness, Hiawatha National Forest, Michigan, USA

Valley Oak, Quercus lobata, fallen leaves in December, Pinnacles National Park, California, USA

[Adiantum aleuticum]

Quaking Aspen, Populus tremuloides, forest of bare branches along beginning of Wheeler Peak Summit Trail in Great Basin National Park, Nevada, USA

[Iris siberica]

Patterns of ice on the Upper Harbor in February in Marquette, Michigan, USA

Early light on Navajo Sandstone shaped like cauliflower, cracked into polygons, at White Pocket, Vermilion Cliffs National Monument, Arizona, USA

Navajo Sandstone shaped like cauliflower, cracked into polygons, at White Pocket, Vermilion Cliffs National Monument, Arizona, USA

Lush mosses growing on recently melted out wet soil along the Cispus River in the Goat Rocks Wilderness, Gifford Pinchot National Forest, Washington State, USA

Parents construct aeronautical models during interactive STEM keynote workshop conducted by Dr. Diana Wehrell-Grabowski during the EYH Conference.

Garden plant

Took this shot from my window which has a mesh.The things outside seemed to form a pattern when i bumped up the contrast. Do you see it or is it just me? :)

Navajo Sandstone shaped like cauliflower, cracked into polygons, at White Pocket, Vermilion Cliffs National Monument, Arizona, USA

Lush mosses growing on recently melted out wet soil along the Cispus River in the Goat Rocks Wilderness, Gifford Pinchot National Forest, Washington State, USA

Kentucky coffeetree, Gymnocladus dioicus, bare branches and seed pods along Interstate 90 in in Minnesota, USA

Quaking Aspen, Populus tremuloides, forest of bare branches along beginning of Wheeler Peak Summit Trail in Great Basin National Park, Nevada, USA

Silky Phacelia, Phacelia sericea, blooming on Heliotrope Ridge below Mount Baker, Mount Baker-Snoqualmie National Forest, Washington State, USA

Inverness, Scotland.