plane{
  y,.1
  pigment{agate}
}
lathe{
  6,
  0
  u/3
  u/3+v
  <.32,on>
  <.32,.5>
  v/2
  pigment{rgbt 1}
  photons{
    refraction 1
    target
  }
  interior{ior 1.5}
}
camera{
  location y+1
  look_at y/2
}
light_source{
  39*y-9*z 1
  photons{refraction 1}
}
global_settings{
  photons{count 1e6}
}
fog{
  distance 2
  rgb 1
}