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What: This isn't the initial time we've had some Akiyosi Kitaoka on the site, and it won't be the final time either. This is a typical instance of illusory motion, where the balls seem to be moving in the edges of your field of vision, but in reality, they are entirely stationary.

How To: Combine different colors, sizes, and spacings to observe how it impacts the illusion. I discovered that the illusion is most powerful when the colors are in contrast and the balls aren't extremely large, though I could still notice it.

Explain it: Another case of Illusory Moment, and as always, Wikipedia offers a great explanation of the current thought process. I've also mentioned within the illusory motion beans illusion how this works (as far as I can comprehend it). Your brain is accustomed to perceiving things that fade in one way or another as moving, and the contrasting colors here are causing a conflict of the senses.