"Gödel, Escher, Bach: An Eternal Golden Braid" (often shortened to GEB) is a Pulitzer Prize-winning book by Douglas Hofstadter, a cognitive scientist. It's a massive, mind-bending exploration of consciousness, self-reference, cognition, artificial intelligence, and the nature of meaning, all wrapped up in a playful and engaging narrative. It's not a light read, but it's incredibly rewarding for those willing to dive in.