The Colour That Isn't There
Stare at a strange landscape for twenty seconds, then watch colour appear on a grey one.
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Как играть
Can you see the colour that isn't there?
Keep your eyes on the small cross for twenty seconds. Don't look away until the picture changes.
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Why it happens
The cells in your eye that respond to a colour tire when they look at it for a long time.
When the colour goes away, the tired cells answer more weakly than their neighbours, and you see the opposite colour for a few seconds: orange leaves blue behind, magenta leaves green.