This urinal was exhibited in Milan the fol­low­ing year, and Duchamp not only confirms the re­pli­ca with his (and R. Mutt’s) sig­na­ture, but also pays tribute to the de­sign by introducing the four flush holes from the Stockholm replica, not in the Stieglitz ori­gi­nal, into the design of his and Arturo Schwarz edi­tion from 1964, effectively making it to an “object-collage”.