El Lissitzky. Proun 19D. 1920 or 1921. Gesso, oil, varnish, crayon, colored papers, sandpaper, graph paper, cardboard, metallic paint, and metal foil on plywood, 38 3/8 x 38 1/4" (97.5 x 97.2 cm). Katherine S. Dreier Bequest
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