Illusion in nature and art / 
edited by R. L. Gregory and E. H. Gombrich, with contributions by Colin Blakemore and others 
 - London :  Duckworth,  1973 
 - 288 p. :  ill. (part col.) ;  24 cm. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>ISBN: </label>0715607558 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Optical illusions.<br/>Visual perception.