#include "colors.inc"
 
 plane {
   y, 0
   pigment { checker color Black color White }
   finish  {reflection 0.3                   }
 }
 
 sphere {
   <-7, 3, -2>, 3
   pigment { color rgb <1, 0, 0> }
   finish  {reflection 0.4       }
 }
 
 sphere {
   <0, 3, -1>, 3
   pigment { color rgb <0, 1, 0> }
   finish  {reflection 0.6       }
 }
 
 sphere {
   <6.5, 3, 0>, 3
   pigment { color rgb <0, 0, 1> }
   finish  {reflection 0.8       }
 }
 
 camera {
   location <2, 4, 20>
   look_at  <0, 0, 0>
 }
 
 light_source {
             <0, 20, 20>
   color rgb <1, 1, 1>
 }