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