Wordnet 3.0
NOUN (1)
1. 
 a Gestalt principle of organization holding that there is an innate tendency to perceive incomplete objects as complete and to close or fill gaps and to perceive asymmetric stimuli as symmetric; 
[syn: closure, law of closure]
WordNet (r) 3.0 (2006):
law of closure
    n 1: a Gestalt principle of organization holding that there is
         an innate tendency to perceive incomplete objects as
         complete and to close or fill gaps and to perceive
         asymmetric stimuli as symmetric [syn: closure, law of
         closure]