Concave Sphere (Hollow Earth theory)
From Kook Science
Concave Sphere is a type of hollow earth hypothesis, broadly holding that the surface of the planet is a sphere that forms the exterior bounds of the universe, such that the universe can be said to be contained within the earth, in the manner that an eggshell contains an embryo. One of the more well-known versions of this hypothesis is the Cellular Cosmogony that was proposed by Cyrus Teed (a.k.a. Koresh), an American religious leader and founder of Koreshanity (Koreshan Universology).
- Koresh; Morrow, U.G. (1905), The Cellular Cosmogony, or, The Earth A Concave Sphere: Part I, The Universology of Koreshanity (with Addendum: "Astronomy's False Foundation"); Part II, The New Geodesy, Estero, Florida: The Guiding Light Publishing House, https://archive.org/details/cellularcosmogo01morrgoog
- "INSIDE THE EARTH'S SURFACE. KORESHAN EXPEDITION INTENDS TO SAIL IN THAT MANNER TO CHINA. WILL GET THERE, OF COURSE. But It Will More Likely Be on the Outside. OTHER FACTS OF KORESH BELIEF.", Pittsburg Post (Pittsburgh, PA): 14, 11 Apr. 1897, https://www.newspapers.com/newspage/86486990/