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Mariposa de Ann Arbor (Butterfly from Ann Arbor), 1978-79 Cast and engraved polyester resin plate embossing, and cutout zinc plate etching, aquatint, engraving and viscosity printing on paper (printed simultaneously using cutout and stacked felts), artist proof, sheet 29 7/8 x 22 1/8 inches (75.9 x 56.2 centimeters), polyester resin plate (cast in an irregular wooden door shape) 22 x 14 1/4 inches (55.9 x 36.2 centimeters), zinc plate (cutout in a butterfly shape) 5 1/8 x 5 1/8 inches (13 x 13 centimeters)