The document discusses the influence of Paul Cezanne on the development of Cubism by Pablo Picasso and Georges Braque. It explains how Cezanne's technique of breaking down objects into geometric shapes like spheres and cubes inspired the two artists. Picasso and Braque then developed Analytic Cubism between 1908-1911, analyzing objects from multiple perspectives and abandoning traditional perspective techniques. The document also mentions Gertrude Stein introducing Picasso to African masks which further influenced the development of Cubism.