Look a these optical illusions!
Baingio Pinna - Convergent and divergent lines (look around with your eyes)
Baingio Pinna - Apparent rotating illusion (look at the dot and move your head back and forth)
Baingio Pinna - Ouchi (moving ball)
Nicholas Wade - Concentric circles (it's not a spiral)
Gianni Sarcone - Impossible fork
Gaetano Kanizsa - Ghost triangle (the triangle is "not" there)
Richard Gregory - Cafewall (horizontal straight lines)
Akiyoshi Kitaoka - Horses (they have the same tone of color)
Akiyoshi Kitaoka - Rotsnake (moving circles)
Jastrow - Duck or Rabbit?
Stanford Slutsky - Parallelogram (cubes on top of each other)