1. ABSTRACTION underconstruction

16. Untitled (Laundry on Clothesline), ca. 1929. Gelatin-silver print, 4 3/8 x 6 7/8 inches. Solomon R. Guggenheim Museum, Gift, The Josef and Anni Albers Foundation. Josef Albers

17. Homage to the Square: Apparition, 1959. Oil on Masonite, 47 1/2 x 47 1/2 inches. Solomon R. Guggenheim Museum. 61.159. © 2003 The Josef and Anni Albers Foundation/ Artists Rights Society (ARS), New York. Josef Albers

18. Abstract Speed + Sound (Velocità astratta + rumore), 1913–14. Oil on board, 54.5 x 76.5 cm, including artists painted frame. Peggy Guggenheim Collection. 76.2553 PG 31. Giacomo Balla © 2003 Artists Rights Society (ARS), New York/SIAE, Rome Giacomo Balla

19. aDusk, 1958. Oil on canvas, 60 3/8 x 48 1/4 inches. Solomon R. Guggenheim Museum. 59.1544. William Baziotes

20. The Room, 1945. Gouache on board, 45.6 x 61 cm. Peggy Guggenheim Collection. 76.2553 PG 156. William Baziotes

21. The Clarinet (La Clarinette), summer–fall 1912. Oil with sand on oval canvas, 91.4 x 64.5 cm. Peggy Guggenheim Collection. 76.2553 PG 7. Georges Braque © 2003 Artists Rights Society (ARS), New York/ADAGP, Paris. Georges Braque

22. Water Towers, 1980. Black-and-white photographs mounted on board, 61 7/8 x 49 7/8 inches overall. Solomon R. Guggenheim Museum, Purchased with funds contributed by Donald Jonas. 81.2793.1-.9. Bernd and Hilla Becher