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This illusion is really interesting. Though you are in fact looking at a still image, the positioning of the letters makes the image look like a wave of motion is moving through it.

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Interesting fact:

Darting your eyes around to various points in this image could make you feel a little bit...ill. The effect is created so easily. Just by the careful placing of shadows and positioning of the letters, our brains see a wave of motion coursing through them. No gifs, people, it’s just your brains freaking out.