Rotating Silhouette In Both Directions Dots In Grid - Hermann's Illusion Test For Stress "Rotating Snakes" - Akiyoshi Kitaoka The Rotating Circlet Misperceptions of Colors - Ted Adelson Multilayered Pictures - Girl Or An Old Woman? Multilayered Images - Joseph Jastro - Duck Or A Rabbit? Feedback Illusion - Swivel Silhouette - Nobuyuki Kayahara Titchener Circles - Ebbinghaus Illusionc Optical Illusion Against Stress