So, just an update to this little project:

I fiddled with some of the functions, and thought more about how best to model
this interesting object.

On the one hand, I'd like to still refine the isosurface approach, ideally
hitting upon a really elegant minimal-surface type approach.

On the other hand, I'd like to get a good representation in a reasonable amount
of time - and it looks like Bezier patches might be the best way to achieve the
smooth, flowing curves.

In the meantime, here's the latest bit of progress trying to harmonize the
"upper" and "lower" sections of the central sheet.

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