Spiral Illusion - Optical Illusion

Spiral Illusion - Optical Illusion.
Trick your eyes into thinking things are moving with this spiral optical illusion. By the way, if you look at the spiral then turn your head to look at the things around you, that will work too.
This was just a bit of fun, if you know why it works then share the answer with others in the comments. If not don't worry just enjoy.
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