For example, in 2 dimensions embedded in our 3 the force potential decreasing with square distance would have given a hint to the 2-dim occupants that they are embedded in 3. We don't see the decreasing with cube, so we don't seems to be embedded in full-flat 4+. (even more - the force falls off linear with distance in galactics, i.e. "dark force"/MOND, which seems to be another indication of some holograghy-like "folding" 3->2 (the other being is the black hole holography))
