This is one of the photos I sneaked at The Whitney, where there is a no photograph rule.
George Segal (1924–2000), Walk, Don’t Walk, 1976. Plaster, cement, metal, painted wood, and electric light, 109 × 72 × 74 inches (276.9 × 182.9 × 188.9 cm) overall. Whitney Museum of American Art, New York
I believe that the images and writing posted here fall under the "fair use" section of the U.S. copyright law http://www.copyright.gov/title17/92chap1.html#107, as they are intended for educational purposes and are not in a medium that is of commercial nature.