Is she spinning to the left... or to the right?
Stare at the green dot, the yellow dots will disappear.
Are they moving together, or not??
Look at either the red or yellow dot, and the other side appears to switch direction.
Focus on the black dot and the grey stripe will turn blue.
Blocks look like they are alternating steps, but they are actually always moving in parallel.
Stare at the black cross in the center and you will soon see a green dot circling around.
Each dot slides back and forth, staying the same color. So how is it rotating?
Look behind the man and the train appears to change directions.
Stare at the center of the image for one full minute - then look away at something. For a few seconds everything will appear to distort.
It's not a moving picture - but it feels like it is!