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Sometimes called transparent metal mirrors, these curiosities from China baffles western scientists for 100 years. The way they works is really surprising.

You can buy Chinese Magic Mirrors from Grand Illusions: https://www.grand-illusions.com/chinese-magic-mirror-c2x26013727

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Correction: 2:29 Ugh, those angles are off. The sides of the divot should be at 22.5 degrees not 45 degrees for those rays to be correct. But you get what I'm trying to show right?!

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