Skyforms1975 · Lithograph in green, blue, yellow, and black on white wove paperImage: 45.5 × 71.9 cm (17 15/16 × 28 5/16 in.); Sheet: 56 × 71.9 cm (22 1/16 × 28 5/16 in.)Art Institute of Chicago
WattsOSSNSeaforms Number 961966 · Watercolor on gesso7 1/4 × 44 1/4 in. (18.4 × 112.4 cm)The Metropolitan Museum of Art
Landforms GA 111930 · Lithograph on white wove paperImage: 30 × 41.7 cm (11 13/16 × 16 7/16 in.); Sheet: 52.4 × 41.7 cm (20 11/16 × 16 7/16 in.)Art Institute of Chicago
Skyforms GA 131930 · Lithograph on white wove paperImage: 31 × 41.9 cm (12 1/4 × 16 1/2 in.); Sheet: 52.4 × 41.9 cm (20 11/16 × 16 1/2 in.)Art Institute of Chicago
Seaforms GA 121930 · Lithograph on white wove paperImage: 30.4 × 41.7 cm (12 × 16 7/16 in.); Sheet: 52 × 41.9 cm (20 1/2 × 16 1/2 in.)Art Institute of Chicago