> Why isn't the surface smaller then? Probably something inside is pushing out? Hoberman spheres expand and contract via forces that act only along the structu

> Why isn't the surface smaller then? Probably something inside is pushing out? Hoberman spheres expand and contract via forces that act only along the structures that make up the surface, and this is a simple classical object. I don't see why a more exotic physical object like a black hole couldn't only have properties defined by its surface.