Follow the movement of the pink dot and the dots will remain pink.

However, if you concentrate at the black ‘ + ‘ in the center of the picture,
the moving dot turns to green .

Now, if you concentrate very hard on the black ‘ + ‘ in the center of the picture all the pink dots will disappear and you will only see the green rotating dot. If you loog away from the ‘+’ the pink dots reappear.

So what you see is not necessarily what you think.

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