check this out...
To see the illusion, you need to stare intently at the black dot in the centre of the image and move your head toward then away from the screen...
Is it a moving image, or are your eyes playing tricks on you?
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Stare at this image long enough and you'll start to see it move before your very eyes or get sick!!
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*edit by phredgreen*
the idea is to say the colours of the words, not read the words themselves. therein lies the challenge.
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