These two constructs are practically identical in functionality:

light_source
{ LIGHT_LOCATION, COLOR
  looks_like { OBJECT }
}

=

union
{ light_source { LIGHT_LOCATION, COLOR }
  object { OBJECT shadowless translate LIGHT_LOCATION }
}

  I hope this helps clearing out how looks_like works.

  (The bit that confuses most new (and even some old) users is the
implicit translation of the looks_like object.)

-- 
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}//  - Warp -

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