Explanations of geometrical illusions.
D004558:Electric Stimulation; D005133:Eye Movements; D005366:Figural Aftereffect; D005403:Fixation, Ocular; D005556:Form Perception; D006801:Humans; D007088:Illusions; D012160:Retina / Q000502:physiology; D012858:Size Perception; D013028:Space Perception; D014793:Visual Cortex / Q000502:physiology