Originally Posted by my_scatterheart

I dunno. It's just kind of tricky, and I like to think about it sometimes.
Like one example that has presented itself is : an axe used by a man for a decade has been in need of repair. He changes the head several times over the course of the years, and does the same with the handle when it splits.
For what it is, the axe is not the same axe at all. It is comprised of completely different pieces than it was originally made of. But to the man it is still the same axe. His axe.