Simon, Seymour. <br/><br/>
Now you see it, now you don't  : the amazing world of optical illusions / 
Seymour Simon ; drawings by Constance Ftera. 
 - Rev. ed. 
 - New York :  Beech Tree,  1998, c1976. 
 - 64 p. :  col. ill. 
<br/><br/> Unlocks the secrets behind dozens of classic illusions. 
<br/><br/> 008-012  BTSB. 
<br/><br/><label>ISBN: </label>0688161529 
<br/><br/><label>LCCN: </label>97049855 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Optical illusions
<br/><br/><label>LC Class. No.: </label>QP495.S57 1998 
<br/><br/><label>Dewey Class. No.: </label>152.14/8