You could define some kind of coordinate transformation that would switch interior and exterior, with appropriate changes to physical laws. It would be impossib

You could define some kind of coordinate transformation that would switch interior and exterior, with appropriate changes to physical laws. It would be impossible to empirically distinguish it from the Euclidean representation we're used to using. The weirdest part of that would be that it'd seem like light doesn't travel in straight lines, which is just crazy talk.