Clockwise from top: Study for Hroswitha, 1972. Colored pencil and graphite on paper. 8 1/2 x 11 in. Courtesy of the estate of Rosemary Mayer and ChertLüdde, Berlin. Abracadabra Sailboat, 1972. Colored pencil and graphite on paper. 11 x 14 in. Courtesy of the estate of Rosemary Mayer and ChertLüdde, Berlin. Net Section, 1972. Colored pencil and graphite on paper. 14 x 17 in. Courtesy of Patricia Martin.