Sam Gilliam (born 1933). “After Glow”, 1972. Acrylic and dye pigments on canvas; 6 ft. 2 1/4 in. x 8 ft. 4 1/4 in. x 2 in. (188.6 x 254.6 x 5.1 cm). © Sam Gilliam. Courtesy of the artist

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