Is the Universe Like a Epagmant Screen?

If the universe did have some sort of, like, strange wall as an edge to it, or some like deformity in its geometry, then that would break this cosmological principle that every location is the same. And then you could measure your velocity relative to that. There would be a special location in space. But still, your velocity would only have meaning relative to something. This is actually really closely connected to, like, all sorts of interesting, deep physics of the universe. You know, the fact that space seems to be the same everywhere,. That if you do your experiment here, and then you transport it ten light years over there and do it again, that you get the