@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.

I would definitely agree that there is no one way to see things. That is, I believe that absolute truth exists, but it's too large for any human to be able to grasp it all. There are infinitely (uncountably even) many truthful ways to see something. Each instant of the river is truly the river, but not the whole river. It would take every moment of the river's existence to compile the entire truth of the river.

Thanks for posting.