When it's spinning smoothly, stare at the center of the spiral for about a minute.
Then look at the back of your hand...
It will appear to be twitching and moving, as though bugs were crawling under your skin!
~Source
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Crawling Spiral Optical Illusion
When it's spinning smoothly, stare at the center of the spiral for about a minute.
Then look at the back of your hand...
It will appear to be twitching and moving, as though bugs were crawling under your skin!
~Source
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