Paul Bourke
pbourke@swin.edu.au
http://astronomy.swin.edu.au

global_settings {
   max_trace_level 1000
}
#declare a = sqrt(2);
#declare r = texture {
   pigment {
      color <1,1,1>
   }
   finish {
      ambient 0 
      diffuse 1 
      reflection 1
   }
}
camera {
   location x-y+z 
   look_at <0,0,0>
}
light_source {
   <-3,-3,-3>
   color <0,1,0>
}
light_source {
   <-3, 3, 3>
   color <0,0,1>
}
light_source {
   < 3, 3,-3>
   color <1,0,0>
}
sphere {
   z-x-y, a 
   texture { r }
}
sphere {
   x+y+z, a 
  texture { r }
}
sphere {
   y-x-z, a 
   texture { r }
}
sphere {
   x-y-z, a 
   texture { r }
}
//pdb

Comment: This is a rendering of a so called "Wada basin boundary"

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