“The system of constraints that governs the projections and transformations of… bodies in space must long ago have become internalized as a powerful, though largely unconscious, part of our perceptual machinery.”

R.N. Shepard (1978). "The mental image." American Psychologist 33, 125-137. Shepard, 1978, p. 136.

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Roger Shepard10

American psychologist 1929

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