That is really cool, a great starting point for some interesting animated
effects. I'm following this with great interest (thinking about what the
addition of *more* spirals/vortices would look like as they all interact-- and
with some warp{turbulence...} thrown into the mix.)

As-is, it looks like the effect is 'confined' to a square; it would be great to
see it confined to a circle instead (if possible)-- to be more like a storm.

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