Chapter 18
Holographic Stereograms
She noticed a curious appearance in the air. It puzzled her very much at first, but in a minute or two she made it out to be a grin…. In another minute the whole head appeared.
Lewis Carroll
Alice in Wonderland
Holographic stereograms, in their basic form, are a hybrid of photography and holography. They retain something of the quality of both, but add something very much of their own. They have their own virtues and vices, their most important advantage over conventional holograms being that they can produce 3D images, even of imaginary subjects, at any desired scale, and with color and movement, too. The only drawback is that, like rainbow transfer holograms, they have parallax in only one direction—almost ...
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