A photogram is a photographic image made without a camera by placing objects directly onto the surface of a photo-sensitive material such as photographic paper and then exposing it to light. The result is a negative shadow image varying in tone, depending on the transparency of the objects used. Areas of the paper that have received no light will appear white; those exposed through transparent or semi-transparent objects appear grey.
Photograms were used in the 20th century by a number of photographers, particularly Man Ray who called them 'rayographs'
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