X-ray of hibiscus --- Image by © Viaframe/Corbis
X-ray of hibiscus --- Image by © Viaframe/Corbis
X-ray of hibiscus --- Image by © Viaframe/Corbis
Snowcovered forest --- Image by © Angelo Christo/Corbis
Anemonae --- Image by © Image Source/Corbis
Echeveria --- Image by © Leonard Gertz/Corbis
Leaves Branching Out from Stem in Radial Pattern --- Image by © Ann Cutting/Corbis
Giant dioon --- Image by © Leonard Gertz/Corbis
New York City, New York State, USA --- Lighted trees at night --- Image by © Jeff Spielman/Corbis
Three Allium by Tom Marks --- Image by © Tom Marks/Corbis
Twisted Trunk by Tom Marks --- Image by © Tom Marks/Corbis
Solitary tree in a winter landscape --- Image by © George Disario/Corbis
2007, Giverny, France --- Looking up at tall trees in Giverny, France, with leaves nearly in silhouette against a white sky. --- Image by © Ken Rosenthal/Corbis
2002, USA --- Human skull against black background --- Image by © Ken Rosenthal/Corbis
Close-up of a Gerbera Daisy (Gerbera jamsonii) --- Image by © George Oze Photography/SuperStock/Corbis
Christmas roses in snow --- Image by © SuperStock/Corbis
Polaroid photo of a single tulip --- Image by © Mike Cullen/Corbis
18 Dec 2011 --- Large cactus --- Image by © Ivary/Corbis
11 Nov 2009, Seattle, Washington State, USA --- Detail of tree trunks illuminated by late fall sunshine in Seattle's arboretum. Digital photograph by Dean Forbes taken on Nov. 11, 2009. --- Image by © Dean Forbes/Corbis
06 Apr 2008 --- Leaves of a succulent plant. Digital photograph by Dean Forbes taken on April 6, 2008. --- Image by © Dean Forbes/Corbis
X-ray of hibiscus --- Image by © Viaframe/Corbis
X-ray of hibiscus --- Image by © Viaframe/Corbis
Reeds on frozen lake --- Image by © Derek James Seaward/Corbis
Plant root system --- Image by © Theo Allofs/Corbis
Frost on plant, winter --- Image by © Mika/Corbis
Agave --- Image by © Leonard Gertz/Corbis
White Flowers --- Image by © Michael Filonow/Corbis
Succulent leaves --- Image by © Leonard Gertz/Corbis
Stromanthe leaves --- Image by © Leonard Gertz/Corbis
2006 --- Vines on Wall by Tom Marks --- Image by © Tom Marks/Corbis
Vines on Window by Tom Marks --- Image by © Tom Marks/Corbis
August 1922, Cutler Ridge, Florida, USA --- A tree's roots wraps itself around a wagon wheel --- Image by © John C. Gifford/National Geographic Creative/Corbis
Group of three metal spheres --- Image by © 2/Chad Baker/Ocean/Corbis
Swirls of smoke --- Image by © 2/Steve Allen/Ocean/Corbis
Close-up of Pink Calla lilies (Zantedeschia rehmannii) --- Image by © George Oze Photography/SuperStock/Corbis
Geometric Shapes on Metal --- Image by © 145/Chris Collins/Ocean/Corbis
04 Nov 2012 --- A closeup of autumn leaves in Brooklyn --- Image by © Mike Cullen/Corbis
07 Aug 2011 --- Image of maidenhair fern. Digital photograph by Dean Forbes taken on Aug. 7, 2011. --- Image by © Dean Forbes/Corbis
28 Mar 2011 --- A flower of a climbing hydrangea (Hydrangea petiolaris). --- Image by © Jill Ferry/Corbis
06 Apr 2008 --- Cactus plants growing in a conservatory fill the frame. Digital photograph by Dean Forbes taken on April 6, 2008. --- Image by © Dean Forbes/Corbis