"[A]lmost all the retinal shapes that objects throw are perspective 'distortions.' Square table-tops constantly present two acute and two obtuse angles; circles drawn on our wallpapers, our carpets, or on sheets of paper, usually show like ellipses; parallels approach as they recede; human bodies are foreshortened; and the transitions from one to another of these altering forms are infinite and continual. Out of the flux, however, one phase always stands prominent., It is the form the object has when we see it easiest and best: and that is when our eyes and the object both are in what may be called the normal position. "
Principles of Psychology, Chapter 20, "The Perception of Space."
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