Umbo (Otto Umbehr) Untitled, ca.1932; photograph; gelatin silver print, 5 1/2 in. x 5 1/16 in. (13.97 cm x 12.86 cm); Collection SFMOMA
Umbo (Otto Umbehr) Untitled, ca.1932; photograph; gelatin silver print, 5 1/2 in. x 5 1/16 in. (13.97 cm x 12.86 cm); Collection SFMOMA