That brings to mind this description of a technique for hand-engraved holograms[1]. > The required tools are so simple that ancient peoples could have drawn th

That brings to mind this description of a technique for hand-engraved holograms[1]. > The required tools are so simple that ancient peoples could have drawn these images in hardened sooty resin pools with wooden tools, had they but known the trick. 1: http://amasci.com/amateur/holo1.html http://amasci.com/amateur/holo1.html