National Geographic News
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Sheri Hathaway
Sheri Hathaway

A yellow butterfly hit my windshield while driving and left a small yellow mark on glass.  Three days later, after rain, while I was driving in bright sunlight I saw the colors of a prism in the spot where the wing had hit.  It was beautiful!  All remnants of the yellow were gone but the "gyroids" remained on the glass and bent the sunlight as it passsed throught the glass.

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