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 a Valise" (1935–41), "Self Portrait in Profile" (1958) and the larger work "Étant Donnés" (1946–66). In 1943, he participated with Maya Deren in her unfinished film "The Witch's Cradle", filmed in Peggy Guggenheim's Art of This Century gallery. From the mid-1930s onward, he collaborated with the Surrealists; however, he did not join the movement, despite the coaxing of André Breton. From then until 1944, together with Max Ernst, Eugenio Granell, and Breton, Duchamp edited the Surrealist periodical "VVV", and served as an advisory editor for the magazine "View", which featured him in its March 1945 edition, thus introducing him to