O'Neill, Catherine   1950- <br/><br/>
You Won't Believe Your Eyes! : / 
C. O'Neill 
 - Washington :    National Geographic Society,  1987. 
 - 104 p. :   ill. ;   28 cm. 
 - Books for World Explorers. .
 - Books for World Explorers .
<br/><br/><label>ISBN: </label>0-87044-611-8 0-87044-616-9  
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Reference Books
<br/><br/><label>Subjects--Index Terms: </label>Optical illusions, visual perception