Abstract
This paper is a comment on the preceding paper in this issue by Pressey and Bross. The author reviews his position on the reversed Müller–Lyer illusion in which the illusion is explained in terms of the ‘enclosing nature’ of the ingoing fins. The two difficulties with this explanation pointed out by Pressey and Bross are discussed. Recent experimental work on the effects of enclosures is reported. A critique of Pressey and Bross's explanation of the reversed Müller–Lyer illusion is presented.

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