Re: [math-fun] Villarceau ovoid?

Bill asked:

I have to believe this thing was discovered rather than invented. Reject surfboard? Lopsided kayak? Anyone know?

According to Wikipedia: "The antiquarian word "celt" (the "c" is pronounced as "s") describes adze-, axe-, chisel- and hoe-shaped lithic tools and weapons. The first modern descriptions of these celts were published in the 1890s when Sir Gilbert Thomas Walker FRS wrote his 'On a curious dynamical property of celts' for the Proceedings of the Cambridge Philosophical Society in Cambridge, England, and 'On a dynamical top' for the Quarterly Journal of Pure and Applied Mathematics in Somerville, Mass."