Photogram
An image made by placing objects directly on photographic paper and exposing it to light, without a camera.
In depth
The result is a negative shadow-image: opaque objects print white, translucent ones render as grey tones, and the surrounding paper goes black. It is the oldest photographic technique, predating the camera image, and it was revived as an avant-garde form by Man Ray and Moholy-Nagy in the 1920s.
Examples in practice
Leaves and a glass tumbler laid on paper and exposed for ten seconds produce white silhouettes with translucent grey interiors.