Comment by Lerc

Apart from the issue of relativity mentioned in the sibling comment.

I can easily imagine a bunch of perpendicular lines to describe a volume and I can use coordinates to indicate a point within that volume. Those are just abstract concepts though. How does something that exists have a position.

If you go further and think of the interactions of particles as expressions of perterberances of a field I guess it comes down to what is the amplitude comprised of and ultimately why is it meaningful that there is a relationship between one field and another in a way that you can say that you are talking about the same place.

Maybe that's what both questions devolve down to. Why do fields interact? Or perhaps, why would a fundamental property have a relationship to anything at all if it is fundamental?