A search for "Cellular Cosmology" quickly lands between two similar-sounding but conceptually opposite ideas:
Both are colloquially called "hollow earth theory". But they are incompatible. This page clarifies the difference.
The "Admiral-Byrd Hollow Earth" traces back to:
It posits: there are entrances at the North and South Poles through which one can enter the Earth's interior. There a parallel culture lives — variously described as spiritually advanced beings (theosophy), a Reichsdeutsche refuge (right-wing esotericism), or a UFO base world (UFO esotericism).
Cellular Cosmology is not that. It claims:
Cellular Cosmology is a geometric hypothesis about the shape of the space we live in. It makes no claims about extraterrestrial inhabitants, secret societies, conspiracies, or occult layers beneath our feet.
Byrd: we live outside; inside is a hidden realm. CC: we live inside — and there is no "outside" in the conventional sense.
This is not a question of "more or less hollow space". It is an inversion: in CC, what Byrd sees as "outside" (conventional outer space with galaxies) is geometrically transformed into the inside of a shell.
Mathematically this is the circle inversion (Mostafa A. Abdelkader, 1981) — a sharply defined mapping that translates each element of conventional astronomy into a concrete position in the inner cosmos.
To lump Cellular Cosmology together with Byrd-style hollow earth overlooks:
Furthermore, Byrd-Hollow embeds in right-wing esoteric and UFO mythology. Cellular Cosmology has nothing to do with these and explicitly distances itself.
One thing the models share: distrust of the conventional astronomical worldview. But this they share with the Flat Earth movement, the Electric Universe school, and geocentrism advocates as well.
The difference lies in rigour. Cellular Cosmology dispenses with: - mythological inhabitants - conspiracy-theoretic explanations - occult layers and hidden worlds - political-esoteric loadings
It focuses purely on the geometry of space and the physics of light.
If you come from Byrd-Hollow and seek a scientific foundation: Cellular Cosmology is the mathematically rigorous variant. But it goes in the opposite direction — inward, not downward.