"The origin of the universe is... the usual idiom is 'debated by philosophers', which is a polite way of saying that no one really knows. It seems unlikely to have existed forever – there are too few ruins, for one thing – but history can be recounted at least three thousand years. Some speculate that the first humans were spirits who formed themselves avatars in order to interact with physical matter; others, that we are the result of breeding animals, as we in turn tamed cattle from wild oxen."
"But I digress. The structure of the universe is generally held to be due to a sort of cosmological buoyancy; as the air rests above the sea and the boundary between them is waves, so one space rests above another, and the shell forms in the boundary between them as a result of their interaction. The earth beneath us, for instance, is a shell of stone formed by the interaction between the liquid fire beneath and the air above, and this process may be observed firsthand – if one is brave or foolhardy enough – in the aftermath of a volcanic eruption."
"Why each shell should be twice the diameter of the next smaller one, I cannot explain; it is one of the symmetries of the universe, just as the moon and sun appear the same size from earth despite being of different distances and true sizes, or that the surface of the earth is half water and half land."
"I know of no credible accounts of the universe having been created, and I suspect that it simply happened; it seems more like the simple sort of thing that arises from the physical natures of dead matter, like a stone sinking in water, than like the chaotic tangle that is characteristic of organic life."
"As for what I think you found above... I assume you reached the celestial shell, but what – fell – from above does not seem much like divine magic. The popular rumor is that the strangeness is from beyond the celestial shell, but what you might have done to reach through it – and return with what you found – I cannot imagine."