Andy Warhol's Mao To Be Auctioned At Christies

NEW YORK - NOVEMBER 15: A man holds his hand up while bidding on a work of art inside the auction house Christie's during the Post-War and contemporary Art sale November 15, 2006 in New York City. Christie's estimates that works by Warhol, Willem de Kooning, Roy Lichtenstein and others could go for up to $220 million in what the auction house says may be the most valuable post-World War II and contemporary art auction in history. Warhol's "Mao" portrait from 1972 went for over 17 million, setting an all time record for the artist. (Photo by Spencer Platt/Getty Images)