  Let's back up in order to bring Heidegger's central concern into better view. (The ‘way in’ to Being and Time that I am about to present follows Gelven 1989 6–7.) Consider some philosophical problems that will be familiar from introductory metaphysics classes: Does the table that I think I see before me exist? Does God exist? Does mind, conceived as an entity distinct from body, exist? These questions have the following form: does x (where x = some particular kind of thing) exist? Questions of this form presuppose that we already know what ‘to exist’ means. We typically don't even notice this presupposition. But Heidegger does, which is why he raises the more fundamental question: what does ‘to exist’ mean? This is one way of asking what Heidegger calls the question of the meaning of Being, and Being and Time is an investigation into that question.