Moving Pictures
This image is not animated. Don't believe me? Try staring at just one part of the image and you'll see it will stop moving. This is an example of a "peripheral drift illusion." It is thought that this illusion occurs because of the slight differences in the time it takes to process different luminances (how intense the light is from a particular area). This slight lag in mental processing tricks the brain into perceiving movement that isn't really there.
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