Photograph of Marcel Duchamp's "Fountain". (Urinal "readymade" signed with joke name; early example of "Dada" art). A paradigmatic example of found-art. Fountain by Marcel Duchamp. 1917. Photograph by Alfred Stieglitz. Photograph of Marcel Duchamp's "Fountain". (Urinal "readymade" signed with joke name; early example of "Dada" art). A paradigmatic example of found-art. Fountain by Marcel Duchamp. 1917. Photograph by Alfred Stieglitz.