Marcel Duchamp speaks of humor in art, the "Golden Section" from 1912, the purpose of futurism, the change that occurred in his painting in 1913 when he tried to free himself from the inheritance of retinal painting, dada demonstrations, surrealism and his friendship with Francis Picabia. He explains what are the "ready-made", he says that he wanted to be represented by his "Nude Descending a Staircase" and gives an explanation of his large glass entitled "The Bride Stripped Bare by Her Bachelors themselves" . Marcel Duchamp, painter Keywords: ART,FRANCE,PAINTING,SURREALISM