Robert Irwin. Scrim veil-Black rectangle-Natural light, Whitney Museum of American Art, New York, 1977. Cloth, metal, and wood, Overall: 144 × 1368 × 49in. (365.8 × 3474.7 × 124.5 cm). Whitney Museum of American Art, New York; gift of the artist, 77.45. ©Robert Irwen/Artists Rights Society (ARS), New York (Photo: Whitney Museum of American Art)