title: Exorcising the double-nail confusion: a reply to Ono.
abstract: Contrary to the claims of Ono it is argued that the principles and rules of direction vision do not account for the double-nail illusions, and that the 'ghost' concept is hidden rather than exorcised in Ono's approach.
mesh_terms: D001921:Brain / Q000502:physiology; D006801:Humans; D007088:Illusions / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D009903:Optical Illusions / Q000502:physiology*; D012160:Retina / Q000502:physiology; D013028:Space Perception / Q000502:physiology