Memorial to the Idea of Man If He Was an Idea  (closed), 1958 Pine, bottle caps, cast-tin toys, glass, metal,  brass, ebony, and enamel 56 1/2 x 38 x 14 1/4 in. (143.5 x 96.5 x 36.2 cm) Museum of Contemporary Art, Chicago, gift of  Susan and Lewis Manilow (1993.34) Green Planet π, 1967 Four-color lithograph (black, blue, green, yellow) Paper: Arches wove paper Composition/Sheet; 24 x 18 in. Printer: Kansas City, Missouri, Kansas City Art  Institute Impressions,  Jack Lemon and others  Estate of Joanna Beall Westermann, Courtesy of Lennon, Weinberg, Inc., New York