James Foster wrote:
> 
> we've all seen these cool-looking light patterns created from shining
> photons through tori and such. Is it possible to design an object to
> give a desired light pattern, such as readable letters?
> 
> I've always wanted to be able to do this. After seeing povrays results
> when using photons i got excited thinking it's very possible to reverse
> what it does to decide where the photons go, to come up with something
> to say what the object should be like.
> 
> what are your thought? im/possible un/cool

It _is_ possible and it is done. It is called crystallography.
It is used to reconstruct crystals from scattered photons (real
ones...) But it is not easy and sometimes ambiguous. 

Markus

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