Artist Christo finances his projects by selling design drawings like this one, a preparatory sketch for the Over the River project on Colorado's Arkansas River. Wolfgang Volz/Copyright Christo 2007 hide caption

itoggle caption Wolfgang Volz/Copyright Christo 2007

Elizabeth Catlett's 1968 sculpture Homage to My Young Black Sisters Allison Keyes/NPR hide caption

itoggle caption Allison Keyes/NPR

The original Mona Lisa is on permanent display at the the Musee du Louvre in Paris. Jean-Pierre Muller/Getty Images hide caption

itoggle caption Jean-Pierre Muller/Getty Images

Oil painting by Marinus van Reymerswaele. Courtesy of Palazzo Strozzi hide caption

itoggle caption Courtesy of Palazzo Strozzi

Influenced by Mexican and Native American art, Pollock popularized action-painting and drip style, as seen in Number 7, 1951. Pollock-Krasner Foundation, National Gallery of Art/Artists Rights Society hide caption

itoggle caption Pollock-Krasner Foundation, National Gallery of Art/Artists Rights Society

An exhibit at the Louvre Museum in Paris explores American landscape painting. Here, the museum's director, Henri Loyrette, looks at the oil paintings of Thomas Cole (1801-1848), known for his realistic and detailed works. Francois Mori/AP hide caption

itoggle caption Francois Mori/AP

About 1,200 tiny custom-made cars zoom around Metropolis II. If there's an accident, the sculpture comes with nearly 11,000 more toy cars, ready to hit the road. Courtesy The Los Angeles County Museum of Art hide caption

itoggle caption Courtesy The Los Angeles County Museum of Art

A painting by Michelet "Najee" Calice, one of the artists featured in the exhibit. Courtesy Of The Artist hide caption

itoggle caption Courtesy Of The Artist

Abstract expressionist artist Helen Frankenthaler, pictured above in 1956, adopted Jackson Pollock's technique of painting canvases laid flat on the floor. She sought to "marry" the paint with the canvas, she said. Gordon Parks/Time Life Pictures/Getty Images hide caption

itoggle caption Gordon Parks/Time Life Pictures/Getty Images