WARNING: Flashing colors This is an illusion called Sigma Motion. It is just two lines switching rapidly. But, however you can control the motion by sliding your finger across the bar, and then focusing on said finger. Click the expand button for it to work best.
Press A to switch to color mode, S to switch back. Some variations of the Sigma Motion don't work as well as others, some work way better, some are slower, while other's are faster, why?
