Alfred Siteglitz Equivalents, over 220 unmanipulated photographs of the sky taken between 1925 and 1934. The pictures function as metaphors of emotional experience at the moment the picture was taken and are some of the first abstract photographic art.
1923. Gelatin silver print, 3 5/8 x 4 5/8″ (9.2 x 11.8 cm). Alfred Stieglitz Collection. Gift of Georgia O’Keeffe. © 2012 The Museum of Modern Art / Artists Rights Society (ARS), New York