Gödel, Escher, Bach: an Eternal Golden Braid

This is my all-time favorite book.

It feels like you are wandering in a place full of wonders and understanding many things that seemed unrelated, while enjoying the company of the author and his quirky creations.

It remains a well-aged book, from which the author's humour and enthusiasm jump at you and massage your brain. Well-suited for those taking interest in mathematics.