Speaking for yourself, of course. The expansion isn't very hard to describe. What's important is that expansions (and curvatures) of a manifold can be detected locally. (Result due to Gauss) The surface of a sphere has no center (or corners). If the sphere is expanding, points will move away from each other. I was hoping someone would say this; what you propose then, is a topographical universe with no core or center whatsoever, right?
Is it then hollow?