The solitaire illusion: An illusion of numerosity

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Abstract

A new illusion in which the apparent number of elements of two kinds is determined by their spatial arrangement is described. The illusion is such that one large cluster appears to contain more elements than several small clusters, clustering being determined by Gestalt principles. The illusion was found both in adults and in children of 8 years. © 1972 Psychonomic Society, Inc.

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APA

Frith, C. D., & Frit, U. (1972). The solitaire illusion: An illusion of numerosity. Perception & Psychophysics, 11(6), 409–410. https://doi.org/10.3758/BF03206279

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