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Visual Cryptography(upload.wikimedia.org)

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Darwin@feddit.deM
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Knusper@feddit.de
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The patterns are identical, except for where the A is. So, when you overlay the black pattern perfectly, it mostly hides the red pattern.

And then where the A is, the red pattern is colored in such a way that it fills in the gaps of the black pattern, leading to a solidly colored area there.

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