title: A single solid that can generate two impossible motion illusions.
abstract: We discovered three-dimensional solids that can generate two different impossible motion illusions. When such a solid is seen from two particular viewpoints, two different shapes are perceived. In both cases the perceived physical motion appears to be impossible.
authors.forename: Kokichi
authors.initials: K
authors.lastname: Sugihara
mesh_terms: D003867:Depth Perception / Q000502:physiology*; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D009903:Optical Illusions / Q000502:physiology*