This course is a philosophical exploration of the ultimate nature of reality. Metaphysical questions include: What is the nature of existence? Of necessity and possibility? What kinds of things are there? In virtue of what is something the very thing it is (rather than something else)? Does an object persist as the same object through time and change? What, if anything, makes you the same person over the course of your life? What is it to be a person at all? To what extent are we genuinely free to choose our actions? If one could not have done other that what one did then how can one be held responsible for one's actions? What is the nature of time? Recommended: a previous course in philosophy.