WASHINGTON - JULY 30:  A portrait of Ernest Hemingway hangs on the wall during the opening of the Art of the Stamp exhibition at the Smithsonian National Postal Museum July 30, 2003  in Washington, DC. The exhibition is of 100 original works of art that were the models for some of the nation's most popular stamps. It spans more than 40 years of stamp history, from 1960 to 2003. (Photo by Joe Raedle/Getty Images)