Just fooling around with textures, really.

Incidentally, I ran into the usual problem with layering
texture_maps (each rectangle is actually a function pattern
similar to f_boxed, and individual textures were intended
to be completely transparent, normal-less and "finish-less"
outside the rectangle). As that didn't work I built them
recursively with texture_maps, with texture n using
texture n-1 outside its rectangle.

Unfortunately, this means I can no longer apply turbulence
to an individual texture (it would also distort all previous
textures). I wonder if I could patch this into my functions.
I noticed there is a "vturbulence" but I think I can't use
it inside a function.

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