CONCEPT
Optic Flow
The structured pattern of visual motion produced by an organism's movement through the environment—Gibson's discovery that skilled perception navigates by reading this flow directly, without calculation, and that instruments replace rather than augment this capacity at a cost.
When a pilot approaches a runway, the visual field does not sit still. Every surface in the scene appears to expand outward from a single point—the point toward which the aircraft is moving. This expanding pattern, which Gibson called optic flow, specifies the direction and speed of locomotion without any computation: the center of expansion is where the organism is headed. An experienced pilot perceives this directly, using the ambient optic array as a navigation instrument more reliable than instruments. A novice pilot, whose attentional system has not yet been educated to detect this invariant, falls back on gauges—slower, more error-prone, more vulnerable to stress. Gibson's insight was that the flow pattern was not a fact the pilot calculated but a perceivable structure the trained pilot learned to read. The analogy to AI augmentation runs directly: the tool can provide the instrument reading, but the practitioner who relies on it exclusively cannot detect when the instrument is