simian <sim### [at] localhostlocaldomain> wrote:
> 	Observable and invisible are different things.

  Right. They are opposite things.

> The hot air over a road is invisible but
> observable by the turbulent distortion.

  It can't be invisible if it's observable. :)

-- 
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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