[freebeard]

I thought you were talking about the frame with infinitely small radii. That's the en.wikipedia.org/wiki/Vesica_piscis


https://i1.wp.com/www.sacredgeometry...ee-circles.png

Maybe we're comparing apples and lemons https://en.wikipedia.org/wiki/Lemon_(geometry)

In geometry, a lemon is a geometric shape, constructed as the surface of revolution of a circular arc of angle less than half of a full circle, rotated about an axis passing through the endpoints of the lens (or arc). The surface of revolution of the complementary arc of the same circle, through the same axis, is called an apple.

Half of a self-intersecting torus

The apple and lemon together make up a self-crossing torus, the surface of revolution of the entire circle, with the apple as the outer shell of the torus and the lemon as its inner shell. The lemon forms the boundary of a convex set, while its surrounding apple is non-convex.

Footballs are lemons.