WHAT DO YOUR EYES SEE
FIRST: NOTE THE COLOR OF THE DOTS....PINK
SECOND: DO THEY WILL APPEAR TO BLINK IN A CIRCULAR MOTION?? YES
THIRD: STARE AT THE (+) IN THE VERY CENTER FOR ABOUT 10-15 SECONDS
FOURTH: CONTINUE TO STARE UNTIL ALL THE PINK SPOTS DISAPPEAR.
 
 

THIS IS A DEMONSTRATION TO SHOW THAT WHAT YOUR EYE PERCEIVES IS NOT ALWAYS WHAT IS REALLY HAPPENING.
IF THE PINK SPOTS STARTED TO DISAPPEAR AND BE REPLACED BY A SINGLE GREEN SPOT, YOU ARE TO BE CONSIDERED NORMAL.
THIS MAY HELP YOU TO UNDERSTAND WHY SOMETIMES A DELAYED TRIGGER CAN CAUSE AN ILLUSIONAL "X"