The two illusions of Müller-Lyer: confusion theory reexamined.
D003867:Depth Perception; D004215:Distance Perception; D005260:Female; D005556:Form Perception; D006801:Humans; D007088:Illusions; D007600:Judgment; D008297:Male; D009949:Orientation; D011601:Psychophysics; D012858:Size Perception