I have a question for the hardcore povrayers (I can only guess the correct
answer, but I'm not sure about it):

  The sky sphere is a sphere of radius 1 around the camera, as I described
in the previous article.
  Now suppose that the camera is at the origin and a ray is shot from it in
the z direction and it hits a reflective object at <0,0,2>. The reflected
ray is shot in the x direction (ie. it made a 90 degrees turn). This
reflected ray doesn't hit anything else.
  Since it doesn't hit anything else, it is tested against the sky sphere.
But since the sky sphere is a sphere of radius 1 at the origin, this ray
doesn't (?) hit it.
  How is this solved?

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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