Photograms are photographic images created without a camera by placing objects directly onto light-sensitive material and exposing it to light. This results in a negative shadow image of varying tones depending on the transparency of the objects. Photograms have gone through three phases of use: 1) Originally to scientifically record natural objects, 2) As an artistic expression in avant-garde movements like Dada and Surrealism, and 3) Contemporary rediscovery by artists using them creatively to produce surreal imagery. The document provides examples and instructions for creating photograms through various techniques and using scanning and editing software.