Graham points out you and I are, ourselves, more like a wave than like a permanent thing. He invites us to think of an experience from your childhood, something you can remember clearly. Something that you can feel, see, maybe even smell as if you were really there. After all, you were there at the time, weren't you? How else would you remember it? But here is the bombshell--you weren't there. Not a single atom that is in your body today was there when that event took place. Matter flows from place to place and momentarily comes together to be you. Whatever you are, therefore, you are not the stuff of which you are made.

--Richard Dawkins, Queerer than We Can Suppose: The Strangeness of Science