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A technology that blows my small mind is holography. I once saw a Russian (or Soviet as the case may be) hologram that had a magnifying glass in the foreground and various objects in the background. If you moved left and right of the hologram and looked at it at an angle, the images in the background would fall behind the image of the magnifying glass and become magnified. All that in a sheet 1/8" thick. Damndest thing I have ever seen.
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