File:Wikibooks povray sphere turbulence 1.png

#include "colors.inc"
camera {
     ultra_wide_angle
     angle 75
     location <2, 3, -4>
     look_at <0, 1, 2>
}

light_source {
    <3, 5, -4>
     color White
 }

plane {
  <0, 1, 0>, -1
     pigment { checker color White, color Blue }
 } 

sphere {
    <0, 1, 2>, 2
     pigment {  gradient y
    color_map{
        [0.2 color Blue  ]
        [0.4 color Red   ]
        [0.6 color Yellow]
        [0.8 rgb<0,1,0>  ]
        [1.0 rgb<0,0,1>  ]
               }
       turbulence 1
     }
}  

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