THE EYE 



FIG. 249. Which squ'are is the 

 larger? Most people would say 

 the white, but the white is the same 

 size as the black. 



FIG. 248. Who is the big- 

 gest? The policeman 

 most people would say. 

 But the policeman is 

 really the smallest, and 

 the little girl is the big- 

 gest. 



FIG. 250. One of these sets of lines 

 looks higher than it is wide, and 

 the other wider than it is high, 

 but both are square. 



FIG. 251. Turn the page round and round to the left. The plain rings will 

 appear to revolve rapidly to the left, and the others to go slowly round in 

 the opposite direction. 



always what they seem. We cannot always believe our own eyes. 

 Our vision of things is never quite perfect. There is always a little 

 error in our sight, and this page shows us how we may deceive our 

 eyes and make them believe that things are not what they are. 



