Time ago I made some experiments, but your patterns are incredibles!
Thank you for sharing the source. This is one of my tests:

/////////////////
#declare f_s=function {sqrt((sin(5*x)+sin(5*y)+sin(10*z))*5)};
//#declare f_s=function {sqrt((sin(2*x)+sin(2*y)+sin(10*z))*5)};

#declare Sky = sky_sphere {
  pigment {
   function {f_s(x,y,z)}
   //turbulence 0.6
   color_map {
      [0.0 color rgbf<.375, .375, .375, 0.2>]
      [0.2 color rgbf<.375, .375, .375, 0.2>]
      [0.2 color rgbf<1, .9, 0.2, 0.1>]
      [0.4 color rgbf<1, .9, 0.5, 0.1>]
   }
    scale 0.1
  }
}
/////////////////

;-)
Paolo

> "Janet" wrote
> Anyone like patterns? I do, so I thought I'd share this discovery.
> The isosurface function from
> http://www.interq.or.jp/blue/kawashu/gallery/unofficial.html provides an
> endless variety of patterns by changing the A and B constants. Below is
the
> source code for the image.
>
> Enjoy, Janet
> parrotdolphin.deviantart.com
>

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