Einstein's Principles of Generallativity

In einstein's physics, em it's all about how you are in relation to something else. So if two things are moving near the speed of light, they're going to perceive themselves differently than a point of reference that isn't moving near thespeed of light. And actually, einstein started out instinctively like because he was very much used reading ernest mach rite,. The philosopher ernst moch pushed this quite a bit, who was an empiricist. But oddly, he kind of settled more for an operational approach at the end.