A.E. van Vogt wrote a fantastic SF novel based on the concept of "the map is not the territory". It's called "The Players of Null-A", if I remember correctly. It became a trilogy. I've re-read it multiple times and in fact, had just started reading it again. Some things did not age well since it was written in 1946, but overall fascinating stuff.
The first book is actually called “The World of Null-A”. I picked it up at a local used book store last year and enjoyed it. Haven’t read any more of the trilogy yet.
[1] https://en.wikipedia.org/wiki/The_World_of_Null-A#Publicatio...