Vik Muniz, Vanitas, Pictures of Soil, 1999
This skull image is a drawing made with dirt, then photographed.
Rebecca Horne (http://rebeccahornephotography.com) is an artist, multi-platform freelance writer, and award-winning photography director. She launched Visual Science for Discover.com in March 2010. She also writes about science and photography for The WallStreet Journal. You can reach her at firstname.lastname@example.org.