"Equivalent, from Set A (Third Set, Print 4)" is a gelatin silver print from Alfred Stieglitz's ambitious series of cloud photographs begun in the 1920s. Through these abstract compositions of shifting clouds and light, Stieglitz sought to demonstrate that photography could convey emotion and meaning independent of literal subject matter, challenging the medium's perceived limitations as a purely documentary tool. The work exemplifies Stieglitz's modernist vision and his belief that photographs could function as pure expressions of artistic intent, equivalent to paintings or drawings in their capacity for subjective interpretation.