Yves Klein | Monochrome bleu, IKB 280, 1957 | Art BaselVienna, AUSTRIA: A visitor looks at paintings by French artist Yves Klein during the exhibition “The Blue Revolution” at the Mumok museum in Vienna, 08 March 2007. A comprehensive retrospective is being dedicated to Yves Klein at the Mumok museum from 09 March to 03 June 2007. AFP PHOTO/Samuel Kubani (Photo credit should read SAMUEL KUBANI/AFP/Getty Images)