> I'm not entirely convinced yet that this isn't a hoax, though -
> basically what they're suggesting is that through their techniques,
> you could reconstruct a hidden surface using the reflections off of
> a non-reflective surface, but I'm not totally convinced that that's
> possible given the dispersal of light.

That demo is *cool*.

I don't see why it isn't possible.  The projector is lighting one tiny 
segment of the card at a time, if it hits a red bit, the book is going to be 
lit with a red hue, very easy to pick up by the camera.  Once it's scanned 
the whole card, it would be easy to build up the picture.

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