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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

3-D spiral
This rotating image gives the illusion of depth. The effect can in intensified by squinting or closing one eye thereby eliminating surrounding objects that might be distracting. The appearance of depth intensifies as the rate of rotation increases. See for yourself.
Receptor fatigue and the illusion of motion

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