“What if I should fall right through the center of the earth… oh, and come out the other side, where people walk upside down.”

The heading of the post is a quote from Alice in Wonderland by Lewis Carroll:

“What if I should fall right through the center of the earth… oh, and come out the other side, where people walk upside down.
If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn’t. And contrary wise, what is, it wouldn’t be. And what it wouldn’t be, it would. You see?”