Related projects, encyclopedia references, and institutional sources
Hollow Earth · Inner-World Cosmology · Free Energy
Memorial archive of Rolf Keppler's lifelong research on Hollow Earth theory, free energy, and inner-world cosmology. After the original domain rolf-keppler.de was taken offline in early 2025, the full archive was re-published here as a memorial to his work.
Sacred Geometry · Perennial Philosophy · Cosmology
Joe Dubs writes on sacred geometry, ancient cosmologies, and the perennial philosophy. His essays explore the geometric and esoteric foundations of traditional worldviews — a complementary perspective on the concentric cosmos.
Cellular Cosmos · Teed & Morrow · Biological Worldview
German-language site dedicated to the biological model of the cosmos. Combines the Copernican–Kepler–Galileo–Newton mathematical framework with the concave-Earth findings of Cyrus R. Teed and Ulysses G. Morrow — a deep exploration of the cellular-cosmology paradigm in its German tradition.
Concave Earth Model · Central Octahedron · Visualizations
English-language collection of animations and geometric arguments for a concave, stationary Earth with a rotating celestial sphere at its center. Note: we recommend the visual basics only — not the speculative extensions (halved planet spheres, a glass shell at 100 km altitude) which the anonymous site author adopts from a particular figure in the scene.
Encyclopedia · Overview
Wikipedia main article on Hohlwelttheorie (German). Covers both the concave-earth tradition (Neupert, Teed) and the Byrd outer-world variant. Reliable references, good entry point.
Encyclopedia · Inner-world specifics
Wikipedia article specifically on the inner-world view – the concave variant in which we live on the inside of a hollow sphere. Distinguishes it from the general hollow-earth concept.
Biography · founder of the modern German Hohlwelt tradition
Biography of Karl Edmund Neupert (1879–1949), founder of the modern German Hohlwelt school and author of "Geokosmos" (1942) and "Der Kampf gegen das kopernikanische Weltbild" (1928).
Biography · founder of Cellular Cosmogony
Biography of Cyrus Reed Teed (1839–1908), known as "Koresh", founder of the Koreshan Unity and of "Cellular Cosmogony" (1898) — the oldest documented modern inner-world theory.
Encyclopedia · Overview
Main English Wikipedia article. Covers both the concave / cellular variant and classical hollow-earth myths. Includes a section "Concave Hollow Earths" for the lineage relevant here.
Biography · founder of Cellular Cosmogony
Detailed English biography of Teed. More extensive than the German entry on his medical career, the 1869 "illumination" experience, and the Koreshan movement in Estero, Florida.
Religious doctrine · theology of the inner world
The religious-theological framework of the Koreshans within which the Cellular Cosmogony is embedded. A synthesis of Hermeticism, Christology, and inner-world cosmology.
Commune · lived inner-world practice in Estero (FL)
The utopian community Teed founded in Estero, Florida. Active from 1894 to circa 1961, now preserved as a historic site. Morrow's geodetic surveys of 1897 are regarded as its experimental core.
Foundation · preserving the original Koreshan settlement in Estero (FL)
Nonprofit foundation dedicated to preserving the Koreshan Historic State Park in Estero, Florida. Offers guided tours of the original Koreshan settlement, events and educational programs.
Cellular Cosmology