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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A form constant is one of several geometric patterns which are recurringly observed during hallucinations and altered states of consciousness.In 1926, Heinrich Klüver systematically studied the effects of mescaline (peyote) on the subjective experiences of its users. In addition to producing hallucinations characterized by bright, "highly saturated" colors and vivid imagery, Klüver noticed that mescaline produced recurring geometric patterns in different users. He called these patterns ''form constants'' and categorized four types: lattices (including honeycombs, checkerboards, and triangles), cobwebs, tunnels, and spirals.