Moonlight: The Pond, Edward Steichen, 1904
Steichen photographed the wooded scene in Mamaroneck, N.Y., hand-colored the black-and-white prints with blue tones and may have even added the glowing moon. The blurring of two mediums was the aim of Pictorialism, which was embraced by professional photographers at the turn of the 20th century as a way to differentiate their work from amateur snapshots taken with newly available handheld cameras. And no single image was more formative than Moonlight.