Quote:
Originally Posted by bns  @yaaarrrgg: That's pretty interesting. I would still say the river exists. It is dynamic, and the idea of river is abstract, but it's still a river. So it still exists and has some kind of properties/substance to it.
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Right here is the crux of the matter...while the specific instance of that river may never be exactly the same again, the concept of "river" is (relatively) unchanged. It exists as an epistemological abstraction within the consciousness of those that know of that river (or of rivers in general).