Readymades of Marcel Duchamp to turn up any identical matches to photographs of the originals. However, there are accounts of Walter Arensberg and Joseph Stella being with Duchamp when he purchased the original "Fountain" at J. L. Mott Iron Works. Such investigations are hampered by the fact that few of the original "readymades" survive, having been lost or destroyed. Those that still exist are predominantly reproductions authorized or designed by Duchamp in the final two decades of his life. Shearer also asserts that the artwork "L.H.O.O.Q." which is recorded to be a poster-copy of the "Mona Lisa" with a moustache drawn on it, is
Marcel Duchamp Duchamp-Villon, Marcel Duchamp, Suzanne Duchamp". Parts of this family exhibition were later shown again at the Musée National d'Art Moderne in Paris. Duchamp participated in the design of the 1938 International Surrealist Exhibition, which was held at the "Galerie des Beaux-arts", Paris. The show featured more than 60 artists from different countries, including approximately 300 paintings, objects, collages, photographs, and installations. The surrealists wanted to create an exhibition which in itself would be a creative act, and André Breton named Duchamp, Wolfgang Paalen, Man Ray, Salvador Dali, and Max Ernst to help him. At the exhibition's entrance Breton placed Salvador