ついに立体的に動いて見える錯視が完成しました。— じゃがりきん (@jagarikin) February 14, 2020
Go ahead, start the playback, focus on one box, or better yet, one part of a box, and watch it "move," yet not go anywhere. This is an example of the the reverse phi illusion. Sora News explains it further.
In very simplified terms, when our eyes see sudden transitions from either light to dark or dark to light, our brains perceive it as motion happening. Take yet another look at @jagarikin’s GIF, and you’ll notice that the edges of the cubes’ blue frames have a sliver of color to them. Sometimes they’re white, sometimes they’re gray, and sometimes they’re black, and as they’re cycling from one to the next, the video’s background is doing the same thing, and the result is the illusionary “rotation” of the cubes.
-via Boing Boing