In the early 20th-century, European avant-garde artists began to look beyond the accepted canons of Western art in a search for new sources of inspiration. "Primitive" art, drawings by children, the art of the insane, and graffiti all opened up new avenues for experimentation and artistic creation. At the end of World War II, leading French artist Jean Dubuffet became interested in the works being produced by psychiatric patients and by other social...