Logic thus seems to rule out 
the possibility that past 
experience can affect 
perception of properties such as 
form or depth. However, 
consider what happens when 
we view the illustrations 
shown to the left, and earlier 
in Chapter 4. 

Past experience enables a 
change in perceptual 
organization and description at 
the moment that recognition of 
these patterns occurs. When 
the figures are recognized, an 
impression of depth is created.