Graceli relativistic coordinates.
Imagine a vehicle in a large spinning wheel on it and observers:

An observer in a vehicle which develops a straight line from center to edge.
And two other different points. But outside of the wheel. The point that the wheel goes in direction and meaning to it, it has a differential concave view [that varies with acceleration and time].
And another has a convex differential vision and the shape varies with the acceleration and time.
Ie, we have results from different coordinates for different observers.