> This time, the URL really *does* say it all!
>
> http://en.wikipedia.org/wiki/Negative_refractive_index
>
> Mmm, I wonder if POV-Ray can do this?

Wow that's something to think about.  It was only a few years ago I learned 
that the refractive index is actually a complex number, useful when working 
with things like polarisers and (liquid) crystals that do funky things to 
the light.

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