These boxes are not moving. A mind-bending optical illusion by Japanese artist Jagarikin.
@JamesTDG @wonderofscience Yes, the quote from the article is misleading: “Using squares to cover up the arrows in the middle, the clip (see below) shows that the cubes are completely still.”
But you can still see in which direction they are moving even if you only see a small part. I first thought that the cubes were the same for each direction, but they’re not. They are actually moving. It seems to be something close to the “ever-rising melody” effect.