[defen]

That's not really satisfying on a human level, though. I can't take your car and claim that it's no longer "your" car since some atoms changed.

To generalize, physical identity seems to be an important part of ownership, so how does that interact with this concept?

[z5h]

Just accept unsatisfying, impractical truths, and despite that, allow yourself to have an illogical intuitionistic sense of things. That's what I do. :)