Gibson's affordances.
Greeno
J G
JG
D049673:History, 20th Century; D006801:Humans; D009039:Motion Perception / Q000502:physiology; D009903:Optical Illusions / Q000502:physiology; D011603:Psychophysiology / Q000266:history*; D014481:United States; D014796:Visual Perception / Q000502:physiology