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The Secret Life of the Brain
History of the Brain 3-D Brain Anatomy Mind Illusions Scanning the Brain The Episodes:

Mind Illusions
Movement Color Angles Form
Movement Study

Combination spiral
A combination spiral is made up of two spirals with lines going in opposite directions. When this combination spiral is rotated, apparent expansion and contraction occur.

Try this: Stare at this spiral for 30 seconds and then look at a stationary object. The afteraffects in the stationary object are opposite to the spiral.
Receptor fatigue and the illusion of motion

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