How can you store a beam of light? https://www.explainthatstuff.com/holo... “Holograms are a bit like photographs that never die. They're sort of ‘photographic ghosts’: they look like three-dimensional photos that have somehow got trapped inside glass, plastic, or metal. When you tilt a credit-card hologram, you see an image of something like a bird moving ‘inside’ the card. How does it get there and what makes it seem to move?”
How That Tupac Hologram At Coachella Worked https://www.npr.org/sections/therecor... “The image looked shockingly good, but how did it work? James Montgomery wrote about the Tupac hologram for MTV news, and explained to NPR's Audie Cornish that the Digital Domain Media Group...used ‘really old theatrical technology’ with a ‘2012 spin.’”
Security Features in U.S. Paper Currency http://mentalfloss.com/article/68643/... “The $100 bill also has a wider, 3D holographic blue security ribbon woven into the paper to the right of Franklin’s portrait. If you tilt the note back and forth you can see the bells change to 100s, and move side to side. This feature adds a highly advanced level of security that’s difficult to simulate.”
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