Robert Irwin. Fractured light-partial scrim ceilings-eye level wire, Museum of Modern Art, New York, 1970, 1977. Pen and ink, transfer type and graphite pencil on paper, Sheet: 30 × 34 7/8in. (76.2 × 88.6 cm). Whitney Museum of American Art, New York; gift of the artist, 77.49. ©Robert Irwen/Artists Rights Society (ARS), New York (Photo: Whitney Museum of American Art)