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1994 November 22, Stuart D. B. Picken, Essentials of Shinto: An Analytical Guide to Principal Teachings, Greenwood Publishing Group, →ISBN, page 146:
The torii marks the entrance to the sacred grounds of a shrine. There are a variety of types of torii, each with a unique history. Regardless of origin, the torii is inseparably identified with the image of Shinto.
So as long as the surface gravity is big enough (by having a small r) this will overcome the centrifugal acceleration and stuff will indeed stay down. But things are much harder to guess for small radius torii.