Well, GG: as to which one of us is the wrong way up ...
“What if I should fall right through the centre of the earth... oh, and come out the other side, where people walk upside down.” That's what Alice asked herself as she fell, endlessly, down the rabbit hole.
And Carroll/Dodgson wrote that line for her because it was a commonly-held misconception (to put it mildly!) that such was the case!
I like to pretend to maintain the fiction, that's all.