
Morris also questions and ultimately dismisses the idea that posed photos cannot serve as documentation and are inauthentic; the fact that something is always excluded from view (intentionally or not) while other things are included means that all pictures are posed to some degree. (This vein of discussion mirrors parts of modern rhetorical theory.)
Most of Believing Is Seeing is a super interesting read. My only complaint is that Morris strayed too far into the weeds in the last section when he forensically examines a set of documentary photos and their related documentation from public works projects of the Depression.
Note:
The book's full title is Believing Is Seeing: Observations On the Mysteries of Photography.