A freaky little thing for you to play with today. A simple animation of some dots that make up a sphere.
The question is, which way is the sphere rotating? Clockwise or anti-clockwise?
Think you've worked it out? Look at it again. Are you SURE it isn't spinning the other way? Keep trying and you'll see it change direction right in front of your eyes.
It's not the animation doing that. It's just a simple loop of some dots, which always travels in the same direction. Whatever you can see in those dots is all in your head.
As seen on Mighty Optical Illusions.