Bodily Continuity
What makes my guitar the same guitar as it was yesterday? There are other, qualitatively identical guitars, that are not my guitar, so it cannot be anything to do with the qualities that it possesses. Plausibly, what makes my guitar my guitar is that it is possible to trace a line through space following its location from one time to the other, that there is no discontinuity in its physical location.
The bodily continuity criterion for personal identity suggests that we apply this approach to personal identity. What makes me the same person as I was ten years ago, then, on this approach, is that it is possible to trace a line through space following the location of my body.
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