Abstract

GREGORY has proposed1 and defended2 an account of the geometric illusions based on the notion of ‘misplaced constancy scaling’. Following Tausch, he suggests that all illusion figures have features indicating depth by perspective which bring into play size constancy scaling, leading to expansion of some parts of the figure relative to others. For this theory he makes the claim that “so far no valid objections seem to have been raised”2. The theory nevertheless needs challenging.

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