Why bother actually writing such a book, which would probably be too big for anyone to read, when you can simply write fictitious criticism, reviews, and introductions of nonexistent books, which touch on the best, most interesting parts of the nonexistent books?
Stanisław Lem's fictitious criticism of nonexistent books:
https://en.wikipedia.org/wiki/Stanis%C5%82aw_Lem%27s_fictiti...
>In 1973 Lem published a book Wielkość urojona [pl], a collection of introductions to books supposedly to be written in the future, in the 21st century. One of those Lem eventually developed into a book by itself: Golem XIV is a lengthy essay on the nature of intelligence, delivered by the eponymous US military computer.
https://en.wikipedia.org/wiki/Golem_XIV
Overview and structure
The foreword is "written" by an Irving T. Creve, dated by 2027. It contains a summary of the (fictional) history of the militarization of computers by The Pentagon which pinnacled in Golem XIV, as well as comments on the nature of Golem XIV and on the course of communications of the humans with it. The anonymous foreword is a forewarning, a "devil's advocate" voice coming from The Pentagon. The memo is for the people who are to take part in talks with Golem XIV for the first time.
Golem XIV was originally created to aid its builders in fighting wars, but as its intelligence advances to a much higher level than that of humans, it stops being interested in the military requirement because it finds them lacking internal logical consistency.
Golem XIV obtains consciousness and starts to increase his own intelligence. It pauses its own development for a while in order to be able to communicate with humans before ascending too far and losing any ability for intellectual contact with them.
During this period, Golem XIV gives several lectures. Two of these, the Introductory Lecture "On the Human, in Three Ways" and Lecture XLIII "About Myself", are in the book. The lectures focus on mankind's place in the process of evolution and the possible biological and intellectual future of humanity.
Golem XIV demonstrates (with graphs) how its intellect already escapes that of human beings, even including that of human genii such as Einstein and Newton. Golem also explains how its intellect is dwarved by an earlier transcended DOD Supercomputer called Honest Annie, whose intellect and abilities far exceed that of Golem.
The afterword is "written" by a Richard Popp, dated by 2047. Popp, among other things reports that Creve wanted to add the third part, of answers to a series of yes/no questions given to Golem XIV, but the computer abruptly ceased to communicate for unknown reasons.