>>21091065If the portal stops, by relativity, the cube would also stop when halfway through the portal.
These "paradoxes" seem way too simple to resolve using basic relativity. I find it more paradoxical to think about gravity. When a cube is halfway through a portal, what are the forces it's subject to? Because it has "two gravities", but actually more than that since there's infinite "copies" of earth through portals if you keep imagining the forces "going through" a portal once and then more times, etc. They're weighted given the further distance the earth "copies" are from the cube, but even still, I think it would add up possibly to infinity. It would be interesting to do simulations for these cases.
