This map is not “upside down”. It looks that way to us; the sense that north is up is a deeply ingrained one. It's grim up north, Dixie is away down south. Yet this is pure convention. The earth is a sphere in space. It has a north and a south, but no up and down.
There’s a famous experiment involving four guys and a door. An unsuspecting test subject is lured into a conversation with a stranger, actually a psychologist. After a few moments, two people appear carrying a large door, and they walk right between the subject and the experimenter.
Behind the door, the experimenter swaps places with one of the door carriers, who may be quite different in voice and appearance. Most subjects don't notice the swap. Perception is lazy: whenever it can get away with it, it merely tells us that things are as we expect, ...
