I just wanted to throw some stuff at you that will mess with your eyes and make you think. This takes a while to load so wait till you see the blue circles before you scroll down.
Look at the X in the middle. The dot going around will turn Green.
Now for some to mess with your mind
Vases or Faces?
Frog or Horse? Tilt your head to the right 90 degrees
Sax player or Lady?
Man and Woman
Odd Couple
Old Lady or Young Girl
Parent and Child Praying
Skull Couple
Horses and Woman
Now for my favorite. Look at the four dots in the middle where it looks like a nose for 30 seconds to a minute, then close your eyes! :-)