This chapter is about the perception of movements on the screen in the mind. This is an interesting psychological read with many insights as to how the human brain works.
  
It starts with nice examples, like, what happens when you see objects moving relative to the background? What if the background itself is moving? etc.
  
The interesting result is that the movements we perceive are completely different from the actual movements measured on the screen.  
This has a good side and a bad side. On the good side, we can give the perception of very complicated motions using only easier and cheaper motions.  
On the bad side, this starts the dilemma of how to move things on the screen as to give the intended perception to the viewer.

Overall that was a nice read. Its implication is that creating an animation can lead to a totally different perception (and maybe totally wrong) in the viewer's eyes. It looks like the only way around this is to show your movies to lots of people and see what they actually see in it, especially if you decide to use some weird tricks or unusual shooting angles