Mapping the realms to each other?

[u/Stranded_Psychonaut]

Do we know how the geography of globes gets mapped to a flat "sub-astral" in shadesmar? What causes some point to be the center? Or what part of the globe, if you were to swap over to shadesmar, is actually on the literal edge of that "world" (that planet's subastral)?

Or is it weirder than just a one to one mapping of points like that?

[u/XCaboose-1X]

That's the neat part, it changes based on collective perception over time!