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Handmade Stereopticon Slide | musefully
Duchamp, Marcel. Handmade Stereopticon Slide, c. 1918-19. Pencil on gelatin silver prints mounted on black-paper-surfaced board, 2 5/8 x 6 3/4" (6.8 x 17.2 cm). Katherine S. Dreier Bequest, 152.1953. (Photo: MoMA)