Philadelphia native Charles Sheeler (1883-1965) is recognized as one of the founding figures of American modernism. Initially trained in impressionist landscape painting, he experimented early in his career with compositions inspired by European modernism before developing a linear, hard-edge style now known as Precisionism. Sheeler is best known for his powerful and compelling images of the Machine Age--stark paintings and photographs of skyscrapers, factories, and power plants--that he created while working in the 1920s and 1930s. Less known, and even lesser studied, is that he worked...