Godel Escher Bach is the best book I've read. Very interesting topics and the sheer creativity of the writing is amazing.
"I Am a Strange Loop" by the same guy covers the same concepts, albeit without the whimsey or color.
(I also enjoyed Joyce the one time I read him, so it's possible that I can just appreciate a good slog...)
But the whims and color were the best things about the book!
I also appreciate that I learned a lot of tangential things mentioned in the book that had nothing to do with the mind or consciousness.
Seriously though, this question is unanswerable, but your answer is probably one of the few books I'd get behind as an answer to this.
— Douglas Hofstadter, I Am a Strange Loop, p. 363
Its translations are also the best translations known to mankind (I read the German one, the French is said to be as good or better).