Realizing who you are not changes everything.
It has been a while since a book from even 10 pages in breaks my model of reality a bit.
Just saying "I have a body" as a separation, instead of "I /am/ body" etc.
Very interesting, fun (witty) succinct.
Its my first Alan Watts book, so that could be part of why it hit me nicely.
Both by Alan Watts: The Way of Zen , and The Book on the Taboo Against Knowing Who You Are 
Get dozens of book recommendations delivered straight to your inbox every Thursday.