CONCEPT
Affordance
Gibson's load-bearing concept: the possibilities for action an environment offers a particular organism — real, relational, value-laden, and present whether or not anyone perceives them.
An affordance is what the environment offers the organism — for good or ill. Introduced in The Ecological Approach to Visual Perception (1979), the concept displaced three centuries of philosophy that treated meaning as something the mind projects onto a meaningless world. For Gibson, meaning is already structured into the environment, available for pickup by any creature with the perceptual apparatus to detect it. A cliff edge affords falling-off. A flat surface at knee height affords sitting-on. A smooth glass slab affords swiping. The affordance is relational — neither a property of the object alone nor of the organism alone — and it exists whether or not anyone perceives it. Applied to designed environments, the concept reveals every interface as a structured field of offerings that shapes behavior before thought enters the picture.
In The You On AI Field Guide
Gibson introduced affordances to destroy the snapshot theory of perception: the view that the world provides impoverished stimuli and the mind enriches them into meaning through computation, memory, and inference. Against