Binocular vision. Seeing in reverse.
Howard
I P
IP
D003867:Depth Perception / Q000502:physiology; D005133:Eye Movements / Q000502:physiology; D009799:Ocular Physiological Phenomena; D015348:Vision, Binocular / Q000502:physiology*; D014793:Visual Cortex / Q000502:physiology; D014795:Visual Pathways / Q000502:physiology