A key American Pictorialist and a crucial innovator in abstract photography, Alvin Langdon Coburn is a fascinating but often neglected figure in the history of American modernism. As early as 1909, Coburn was making futuristic depictions of New York and Pittsburgh, anticipating modernist architectural photography's classic "bird's-eye" view. In 1912, in New York, working with the Cubist artist-poet Max Weber, he developed this idiom a step further,...