It has been suggested by some theorists that regular, common, symmetrical forms evoke perceptual schemas or sets of pre-implications that make them relatively resistant to imposed perceptual distortions. In this experiment, the Mueller-Lyer illusion was superimposed on forms varying in regularity. The results indicate that any closed figure is resistant to distortion, although the degree of its resistance does not vary as a function of the regularity of the form.
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