Read The Mind’s I: Fantasies and Reflections on Self and Soul by Dennett and Hofstadter. This is a book that tackles the question who/what am I? in such a way as to leave you with more questions at the end. It is great if you really want to be challenged.

The book is actually edited by the two, and it is full of various texts that give you different viewpoints. It is a great mix of fiction and non fiction texts, suitable both for the specialist and the novice. The book is particularly good to take abreak from it all, and still be active at a mental leval.