This might be retarded, but how can centrifugal force work? Reference frame dictates how we view inertia so if you're inside a torus, a satellite outside would seem to orbit you. But the objects inside the torus are compelled to move to the inner walls of the torus. Doesn't that prove that movement is an objective thing and it's not just frame of reference? But how the fuck can that be? How can the objects inside the torus determine whether or not the torus is moving? Nothing outside the torus does. I feel like I'm missing something.