Klein, a French painter and performance artist, was a leader of the avant-garde movement called Nouveau Réalisme and greatly influenced the development of Minimalism. In the 1950s, he began to exhibit nonobjective monochrome paintings and from 1957 onward used only a shade of blue now known as International Klein Blue. His 1958 exhibition The Void featured an empty, white-painted gallery. He experimented with several unorthodox methods to create his works. What were his “living brushes”? Discuss