Max Ernst, Le start du châtaigner (The Start of the Chestnut Tree), 1925. Frottage with graphite pencil, and gouache. Courtesy of the Morgan Library & Museum, New York. Gift of Walter Feilchenfeldt in honor of Eugene and Clare Thaw, 2011.28. © 2012 Artists Rights Society (ARS), New York / ADAGP, Paris. Photo: Graham S. Haber, 2012.