Like all other animals, humans can only experience the immediate past. Many scores of milliseconds must pass before any change in the world can be registered by a sense organ or interpreted by a brain. This perceptual lag behind the world, measured from the moments at which changes actually occur and the moments at which we can apprehend them, has become know as 'reaction time'.

(c) Oxford University Press

Richard Gregory, Oxford Companion to the Mind.

Balancing Stick
Benham's Disk
Bicycle Legs
Delayed Speech
Mimosa House
Reaction Time

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