I always imagined it as everything always moved at the speed of light in spacetime, like 4d motion vectors that were always the same length. Acceleration is c

I always imagined it as everything always moved at the speed of light in spacetime, like 4d motion vectors that were always the same length. Acceleration is changing the angle of the vector to move through more space and less time. Space curvature causes motion on stationary objects (gravity) because of some of the time motion becomes space motion. I kind of assume this is incorrect because it seems like a simple explanation and explanations of this stuff tend to not be simple