Straightness and the sphere of vision.
Tyler
Christopher W
CW
D003867:Depth Perception / Q000502:physiology*; D006801:Humans; D008954:Models, Biological; D013028:Space Perception / Q000502:physiology; D015348:Vision, Binocular / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*