Paul Thek (1933–1988), Triptych, 1969. Chalk, watercolor, and fixative on blackboard, 39 ¼ x 157 ¾ in. (99.7 × 400.7 cm). Collection of Daniel W. Dietrich II © The Estate of George Paul Thek; courtesy of Alexander and Bonin, New York. Photograph by D. James Dee