The technology of pure imagination is holograms, for many sci-fi types, this is a simple question either you have or you haven't seen one. If you've seen one, then let us know where it was.
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As I recall, Disneyland has some in a few of their themed rides. It looks for all the world like you're seeing a real, 3-D image. If you've ever seen an IMAX movie, it is very similar.
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