"I claim that the borders between us are more like borders between oceans than like the borders between pebbles or lakes and though we can for practical and social purposes use them to draw boundaries between us, the boundaries we draw—on a deeper level—do not really matter, in the sense that they do not track any deep metaphysical truths about the nature of persons. The boundaries we draw along the borders between us exist only in our maps of ourselves, not in ourselves as we are: personal identity is not border-bound."