So, I was just stirring some boiling water to make some pasta, and the vortex
was actually 5-sided, with the water from the preceding side apparently sliding
underneath the next.

Things like this are becoming increasingly hard to research, as web searches
aren't what they used to be.  Like finding "troposkein".

Might anyone know of a mention of this in the mathematical, geometric, or
physical science literature?   Seems like it would be a cool 3D curve to make -
once I have the requisite round tuits.

- BE

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