One of the more fascinating book trios ever written. The same author, Aldous Huxley, progressing through: 1. Intellectualizing the experiences of experiencers 2. Experiencing 3. Translating the intellectualization and the experience into a novel / thought experiment

And with so much time in between each: The Perennial Philosophy (1945) Doors of Perception (1954) Island (1962)

Also interesting/a shame that so many more people have read his dystopian fiction (Brave New World) vs. his utopian fiction (Island)