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