Abstract art based on Cézanne's idea that all depiction of nature can be reduced to three solids: cube, sphere and cone. With the painting "Les Demoiselles d'Avignon" (1907), Picasso dramatically created a new and radical picture depicting a raw and primitive brothel scene with five prostitutes, violently painted women, reminiscent of African tribal masks and his own new Cubist inventions. Analytic cubism was jointly developed by Pablo Picasso and Georges Braque, from about 1908 through 1912. Analytic cubism, the first clear manifestation of cubism, was followed by Synthetic cubism, practiced by Braque, Picasso, Fernand Léger, Juan Gris, Albert Gleizes, Marcel Duchamp and
Naïve art of perspective. One particularly influential painter of "naïve art" was Henri Rousseau (1844–1910), a French Post-Impressionist who was discovered by Pablo Picasso. Naïve art is often seen as outsider art that is by someone without formal (or little) training or degree. While this was true before the twentieth century, there are now academies for naïve art. Naïve art is now a fully recognized art genre, represented in art galleries worldwide. The characteristics of naïve art are an awkward relationship to the formal qualities of painting, especially not respecting the three rules of the perspective (such as defined by the "Progressive