Definition
A visual illusion in which a single, stationary point of light viewed against a dark, featureless background appears to move on its own after being stared at for several seconds. The apparent motion is not real -- it is created by tiny involuntary movements of the eyes when there are no surrounding visual references to fix the light's position.
Plain English
If you stare at one small light in the dark for long enough, it starts to look like it is moving, even though it is not. Your eyes are creating the illusion because there is nothing else around the light to anchor it.
Context Anchor
Encountered during night flying when looking at isolated lights, stars, or distant ground lights with few other visual references.
Derivation
From Greek 'auto' meaning 'self' and 'kinesis' meaning 'motion' -- literally 'self-motion.' The name describes the illusion exactly: the light appears to move by itself, with no outside cause.
Why Pilots Care
This illusion can lead pilots to misjudge the position or motion of lights, potentially causing spatial disorientation or incorrect collision avoidance decisions during night operations.
Analogy
It is like staring at a tiny light in a dark room until it seems to drift. The light has not moved; your eyes and brain have lost enough surrounding references to judge its position reliably.
Grounding Statement
A single light in a dark, empty-looking sky can appear to wander if you stare at it too long.
Intuition Check
Autokinesis does not mean the light is moving by itself. It means a still light can appear to move when your eyes lack nearby references.
Example Sentence 1
On a dark night with no horizon, the instructor warned the student to keep scanning outside so autokinesis would not make a distant tower light appear to drift.
Example Sentence 2
Training emphasizes that autokinesis can make a stationary aircraft light look like it is changing position, so pilots avoid prolonged fixation on single lights.