Literature/1977/Gibson

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 * Affordance
 * He defined affordances as all "action possibilities" latent in the environment, objectively measurable and independent of the individual's ability to recognize them, but always in relation to the actor and therefore dependent on their capabilities. For instance, a set of steps which rises four feet high does not afford the act of climbing if the actor is a crawling infant.
 * In 1988, Donald Norman appropriated the term affordances in the context of human-machine interaction to refer to just those action possibilities that are readily perceivable by an actor.