A wealth of information on sight, perception, contextual knowledge and explanations of where it falters or cannot make a decision. Personally, I would have liked to see more graphical examples to clarify the point made as well as a better connection between the topic at hand and its overarching framework, either the periodic table or the contextual framework. The experiments conducted that have lead to the results are rarely explained.
The book is therefore best read as a series of anecdotes, with empirical results and background circumstances. Also the many sidenotes are absorbing, such as whether illusions are perceived by babies, primates and parrots, as well as the experiences of people whose vision is restored after a lifetime of blindness.