Slowing working through things.

To help me work through understanding how to use the end result of all of the
daisy-chained algorithms in an actual texture, I needed to understand how to
remap <x, y> into <r, theta>

So here's a nice pigment {function {}} to make an infinite spiral in the xy
plane.

(Thanks again, ShaderToy coders!)

I think this would be a nice basic stock pattern for POV-Ray.
I set the spiral turn spacing to twice the line thickness to get a "maximally
dense" spiral.

- BW

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