Cubism
"One of the most influential art movements of the twentieth century, Cubism was begun by Pablo Picasso and Georges Braque in 1907. They were greatly inspired by African sculpture, by painters Cézanne and Seurat, and by the Fauves. In Cubism the subject matter is broken up, analyzed, and reassembled in an abstracted form. Picasso and Braque initiated the movement when they followed the advice of Cézanne, who in 1904 said artists should treat nature "in terms of the cylinder, the sphere and the cone.“ There were three phases in the development of Cubism: Facet Cubism, Analytic Cubism, and Synthetic Cubism." – artlex.com