New Scientist TV: Friday Illusion: Control this animation with your mind | omnia mea mecum fero |

If you watch this video normally, the moving circles in the first animation rotate while the shifting dots in the second clip follow a horizontal path. But if you look away and watch the movie out of the corner of your eye, the direction of motion will appear to change. In both cases, the moving objects seem to follow the direction of the background stripes.

Via Sakis Koukouvis