ABSTRACT
Usually great care is taken in the typical transposition experiment to keep the ratio between sizes precisely the same in all the pairs of sizes used in the experiment. There is surprisingly little information about the influence of perceptual frames of reference on the way people make judgements about size. Certainly there is very much more information about framework effects on children's perception of orientation and position than on their perception of size. Size constancy experiments are also about the way people judge size, specifically the size of the same object from different distances. Size constancy experiments invariably study this question by investigating the way in which an observer compares the sizes of two objects placed at different distances from him. The central problem in size constancy experiments has always been how people manage to avoid depending entirely on the size of the retinal image.
