Philosophical questions are never far below the surface in AI! For example: What is intelligence? What is artificial intelligence? Can a machine think? (cf. Alan Turing) Is the brain a computer? (cf. John Searle) How can thoughts be about something? What is ‘free will’? Can a computer exercise free will (like Hal in 2001: A Space Odyssey)? What is consciousness? Is consciousness essential to thought? Is machine consciousness possible?