Ever seen this optical illusion before?
Simply focus on the tiny dot in the middle of the two circles and then move your head toward the computer and then away from the computer.....
Don't take your eyes off the tiny dot. Forward then backward while looking at the tiny dot.
Have Noticed the circles are moving?
Notice they are moving in opposite directions?
Notice the neighbors watching you through the window laughing?
You are getting sleepy.....very, very sleepy........... Can anyone explain this illusion.....?