I'm positive that more than one object, each with different topology, would
be able to produce the same light effect. It's still difficult to find just
one of them.

I just had a thought (some of you out there probably already had) Daniel i
think this is what you were trying to say...

If you have a lense and it projects a dense circle of light (from a source
behind it) onto a plane, then get a second lense and stick it next to the
first, it too will produce a dense circle of light on the plane, now rotatle
the second one to place it's bright patch where you want it relative to the
first. And Repeat. build up a pattern of dots which can be read.

This would be the first step!! Then we just need to reduce it down and Blob
it (as Daniel Said)

Daniel Matthews wrote:

> 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.

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