Christo, Over the River, Project for Arkansas River, State of Colorado, Drawing 2006. Pencil, pastel, wax crayon, charcoal and tape; 27-3/4 x 30-1/2 in. Photo: Andre Grossmann. Copyright Christo 2006 Ref. #3

Alexis Rockman, Untitled (Vertical Glacier), 2006 Oil paint on paper. Denver Art Museum; Gift of the Hitchcock Foundation and the Baldwin-Edwards Charitable Foundation in Memory of Harley Baldwin, 2007.36 © 2012 Alexis Rockman / Artists Rights Society (ARS), New York

Saul Steinberg, 4 Banks, 1974. Colored graphite on paper; 19-3/8 x 25-9/16 in. Courtesy of Gretchen and John Berggruen, San Francisco. Photo courtesy John Berggruen Gallery, San Francisco. © The Saul Steinberg Foundation / Artists Rights Society (ARS), New York

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