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 which he studied for the rest of his life to the exclusion of most other activities. Duchamp is seen, briefly, playing chess with Man Ray in the short film "Entr'acte" (1924) by René Clair. He designed the 1925 Poster for the Third French Chess Championship, and as a competitor in the event, finished at fifty percent (3–3, with two draws), earning the title of chess master. During this period his fascination with chess so distressed his first wife that she glued his pieces to the board. Duchamp continued to play in the French Championships and also in the Chess Olympiads