The document discusses the history and process of photograms. Photograms are photographic images made without a camera by placing objects on light-sensitive material and exposing it to light. They have gone through three phases: 1) Recording natural objects scientifically, 2) Used as an artistic expression by Dada and Surrealist artists, 3) Contemporary artists use them to create complex and surreal artwork. Examples are given of artists from each phase, including their techniques and themes.
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