Scientists and art experts found a hidden painting beneath one of Picasso's first masterpieces, The Blue Room, thanks to advances in infrared technology. Here, associate conservator Patricia Favero of The Phillips Collection points to a detail in the image. Evan Vucci/AP hide caption

Picasso's 1914 cubist drawing L'homme au Gibus, or Man in the Opera Hat, is presented at Sotheby's auction house in Paris. Remy de la Mauviniere/AP hide caption

There's an empty space today where a Henri Matisse painting had been hanging at the Kunsthal museum in Rotterdam, Netherlands. Seven paintings were stolen Tuesday, including works by Pablo Picasso, Claude Monet and Paul Gauguin. Peter Dejong/AP hide caption

Spanish painter Pablo Picasso in October, 1971. Ralph Gatti/AFP/Getty Images hide caption