It is sort of your basic John Carter of Mars tale of white guys in an alien land, but filtered through some Dunsany-like prose, just florid as get-out. It made me really long for the academic footnotes. Anyhow, here is how I think it played out. On the proto-Earth—or well in the center of it, anyhow—the Tuatha de Danaan-esque Taithu evolve. Bird-lizard-angel-people. Three of them are like the cream of the crop, and they create the Shining One, because they see life evolving on the surface and they want a toy of their own to play with. The Shining One is a tool that surpasses its makers—basically their artificial intelligence that eclipses them. During all of this, maybe during the age of dinosaurs, some frog-apes find their way into the cavern, and they are allowed to live there, until they evolve into the sentient frog-people of the Akka. The rest of the Taithu sort of disappear—maybe actually to actual Ireland—while the tensions between the Silent Ones and the Shining One mount. Eventually, they make contact with the surface of the Earth, where humans finally exist. There is a caste system—most people have dark hair, but blonde people are moon cultists and red haired people are sun cultists. They are brought into the hollow of the Earth and their breeding patterns create the three sub-races of humans.
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