Search Result for "shape constancy":
Wordnet 3.0

NOUN (1)

1. the tendency to perceive the shape of a rigid object as constant despite differences in the viewing angle (and consequent differences in the shape of the pattern projected on the retina of the eye); 



WordNet (r) 3.0 (2006):

shape constancy
    n 1: the tendency to perceive the shape of a rigid object as
         constant despite differences in the viewing angle (and
         consequent differences in the shape of the pattern
         projected on the retina of the eye)