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Pink or . . . Green !

If you follow the movement of the rotating pink dot with your eyes, the dots will remain only one color, pink.However, if you stare at the black + in the center, the moving dot will turn green.Keep concentrating on the black + in the center of the picture. After a short period, all the pink dots will slowly disappear and you will only see a single green dot moving in a circle.

Pink Floyd - Let There Be More Light (BBC)

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