Look..see..then...you will know.
If you take a look at the following picture , what can you see?Let me tell you one thing. This picture is not animated.Really???But, its moving! No, the truth is it is not moving.Your eyes are making it move. ???To test this, stare at one spot for a couple seconds and everything will stop moving. ???Or look at the black center of each circle and it will stop mov ing. ???But move your eyes to the next black center and the previous will move after you take your eyes away from it…. ???Weird ???
Let's have a test by looking at this picture! =)
Got the fact? ;)