Books that are interesting for reasons other than their textual content?

Continuing the discussion from Computer Lib/Dream Machines:

This makes a lot of sense! Curious if we can think of other books that similarly are somehow really interesting, perhaps for their structure, particular moment in history / web of influences, certain unique approach, holistic distinctive weirdness, etc. but not as much for the actual text itself.

(FYI I split this > a new discussion to test the “reply as linked topic” feature here…available by clicking the little reply arrow in the upper left of the composer window! Useful to keep tangents contained etc.)