[N0B0DY]

When I started to read "smaller parts of the universe" I thought you might lead to something along the lines of more and more refined mediums to allow for movement.

With respect to anything being outside the universe, whether known or not, I would think that should be considered part of the universe (or omniverse, if that makes more sense).

With respect to the other options for movement, I think the only somewhat feasible option would be expansion. Yet, expansion implies an expansion into an existing place/space, but the generally-accepted notion for expansion is that space itself is expanding so it obviously runs into a problem in that regard. The expansion, or any other type of movement, would have to relate to the relativity you referred to. In the sense that one reference frame jumps to another relative to reference frames of lesser scales.

I'm still not sure how literal we could make it, though I'm open to suggestions. If it could be proven to me that matter is clearly distinct from space, as I think Dave has implied, I would concede to a literal movement and/or universe. Until then, I have to remain fairly confident that it can't be done.