Contents

24 March 1972
Vol 175, Issue 4028

About The Cover

Figures and objects of the same physical size appear different when their apparent distances differ as a result of a ``projected'' stimulus for distance. This illusion is one instance of the class of size illusions resulting from manipulation of distance stimuli which normally preserve perceptual constancy. See page 1335. [Drawing by Gary Swinton, Monash University]