Fountain, 1950 version of 1917 original, Marcel Duchamp, Philadelphia Museum of Art, 125th Anniversary Acquisition. Gift (by exchange) of Mrs. Herbert Cameron Morris, 1998. © Artists Rights Society (ARS), New York / ADAGP, Paris / Estate of Marcel Duchamp

Fountain by R. Mutt, 1917, Alfred Stieglitz, Published in The Blind Man (No. 2), Edited by Marcel Duchamp, Henri-Pierre Roché, and Beatrice Wood, May 1917, Philadelphia Museum of Art, © Artists Rights Society (ARS), New York / ADAGP, Paris. 

Duchamp’s studio at 33 West 67^th Street, New York, 1917-18, Henri-Pierre Roché, Gelatin silver print, Philadelphia Museum of Art, © Artists Rights Society (ARS), New York / ADAGP, Paris. 

The Blind Man (No. 1), Edited by Marcel Duchamp, Henri-Pierre Roché, and Beatrice Wood, April 10, 1917, Philadelphia Museum of Art, © Artists Rights Society (ARS), New York / ADAGP, Paris. 

Chocolate Grinder (No. 2), 1914, Marcel Duchamp, Oil, graphite, and thread on canvas, Philadelphia Museum of Art, The Louise and Walter Arensberg Collection, 1950, © Artists Rights Society (ARS), New York / ADAGP, Paris. 

Marcel Duchamp, 1917, Edward Steichen, Philadelphia Museum of Art © Estate of Edward Steichen