Now look at this version of the photograph. All I did was cut out the figure in the white t-shirt and paste him down near the feet of some of the people in the front. The figures are exactly the same size. Measure them! This photograph represents a variation of a classic demonstration of the power of size constancy done by Boring (1964).
Just to prove I have not manipulated these figures, I have developed three additional versions of this demonstration:
Check these pages out for some interesting effects.
Boring, E. G. (1964). Size constancy in a picture. American Journal of Psychology, 77, 494-498.
Copyright, 1999, John H. Krantz, all rights reserved.