Blob a 2d array of convex and/or concave lenses to generate a pattern of 
caustics that corresponds to an image. Keep in mind that it will have a 
mean focal point so the projection surface needs to be in parallel to the 
lens array, unless you get clever and graduate the focal points of the 
lenses so that the array has a skewed projection.

This could be a Macro?

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
> 
> James

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