title: The Fraser illusion: simple figures.
authors.forename: G W
authors.initials: GW
authors.lastname: Stuart
authors.forename: R H
authors.initials: RH
authors.lastname: Day
mesh_terms: D000293:Adolescent; D000328:Adult; D005556:Form Perception; D006801:Humans; D007088:Illusions; D009903:Optical Illusions; D009949:Orientation; D010364:Pattern Recognition, Visual; D011601:Psychophysics