154 



THE SEVEN FOLLIES OF SCIENCE 



ence being due to the arrangement of the divergent lines 

 at the ends. 



Converging lines have a curious effect upon apparent 

 size. Thus in Fig. 30 we have a wall and three posts, and 



A 



V 



V 



A 



Fig. 28. Fig. 29. 



if asked which of the posts was the highest, most persons 

 would name C, but measurement will show that A is the 

 highest and that C is the shortest. 



A still more striking effect is produced in two parallel 

 lines by crossing them with a series of oblique lines as seen 



Fig. 31. 



in Figs. 31 and 32. In Fig. 31 the horizontal lines seem to 

 be much closer at the right-hand ends than at the left, but 



