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Try this: Stare at the spiral (on URL below) for 30 seconds and then look at a this beautiful sunset.
The afteraffects in the stationary object
are opposite to the spiral.
CLICK to SPIRAL: http://www.pbs.org/wnet/brain/illusions
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Try this: Stare at the spiral (on URL below) for 30 seconds and then look at a this beautiful sunset.
The afteraffects in the stationary object
are opposite to the spiral.
CLICK to SPIRAL: http://www.pbs.org/wnet/brain/illusions
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