Monday, January 01, 2024
parallel straight lines an approximation
A straight line is a ray of light in real space, and can be bent by nearby masses. So parallel lines will be bent slightly differently as they pass through space. Indeed one might be able to get them to cross, and recross multiple times.
I think this makes it difficult to difficult to define surfaces.
Lensing by blackholes might produce a ring of images, as if out of focus, which you would have to refocus. I think things could even get inside out, in some sense.
It all begs the question whether we get hoodwinked by euclidean geometry
M
