This picture is not moving.
I know it appears to be. Click the image and read the URL; this is a jpeg file, not a GIF. Jpeg’s are not animated. If you pick one spot on the picture, anywhere, and stare at it without moving your eyes, then the whole thing will stop moving on you in a few seconds. When you move your eyes again, it will take off. I had a very similar image a few years ago that I printed out, and even on paper it kept squirming.
*Optical Dillusion – it’s one of the words I use like beautimous, aminal and edumacation.