Scratch holograms
Detail of "World Brain" by Gabriel Liebermann
You may not have realized it, but you have observed, on an almost daily basis, the type of "hologram" that Irvika posted about below.
Every time you see a polished surface that has suffered some sort of abrasion you will notice that the scratches or even finger markings change as you move because of the incident angle of the light upon that surface. If you do that very methodically, like William J. Beaty does in his video you can achieve some interesting results.
Although not technically a hologram (1947) which reconstructs a 3D image by using laser interference, the one in question is based on diffraction, which is similar to what is currently called "rainbow transmission hologram", commonly used in credit cards, security stickers on products etc. This type does not require lasers to be "reconstructed" and it uses something more akin to the grooves on an old LP vinyl record to reflect images in the plastic substrate according to the surface relief patterns.
One of the first to play with the idea of scratching a polished surface to create the type of "scratchogram" was Gabriel Liebermann, who basically after many trials and errors decided to use a modified "function plotter" to engrave or scratch the surface. Very much in the same way we saw the Lego printer print Hello World today but using a needle instead of a pen!
Like Yukari quoted before:
"The secret(to doing something unique)is: don't look to other jugglers for inspiration - look everywhere else."
Which is similar to what Beaty himself quotes on his site:
"Research is to see what everybody else has seen,
and to think what nobody else has thought."
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