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I believe that the stereogram's gradual increase in popularity over the years is due to the fact that they don't display a lot of the characteristics that are usually criticized in normal display holography. Also fewer restrictions in subject matter means that almost any object or scene that can be photographed can be recorded. With more and more holographers using stereograms, existing photographic techniques can be employed for creative use. Using stereograms gives the artist/holographer increased creative possibilities and using existing photomontage techniques these possibilities increase even further.
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