Marcel Duchamp the Broken Arm", followed soon after. His "Fountain", a urinal signed with the pseudonym "R. Mutt", shocked the art world in 1917. "Fountain" was selected in 2004 as "the most influential artwork of the 20th century" by 500 renowned artists and historians. In 1919, Duchamp made a parody of the "Mona Lisa" by adorning a cheap reproduction of the painting with a mustache and goatee. To this he added the inscription "L.H.O.O.Q.", a phonetic game which, when read out loud in French quickly sounds like ""Elle a chaud au cul"". This can be translated as "She has a hot ass,"
Marcel Duchamp created the Société Anonyme in 1920, along with Katherine Dreier and Man Ray. This was the beginning of his lifelong involvement in art dealing and collecting. The group collected modern art works, and arranged modern art exhibitions and lectures throughout the 1930s. By this time Walter Pach, one of the coordinators of the 1913 Armory Show, sought Duchamp's advice on modern art. Beginning with Société Anonyme, Dreier also depended on Duchamp's counsel in gathering her collection, as did Arensberg. Later Peggy Guggenheim, Museum of Modern Art directors Alfred Barr and James Johnson Sweeney consulted with Duchamp on their modern art