Dots.
If your eyes follow the movement of the rotating pink dot, you will only see one color, pink.
However. if you stare at the black "+" in the center, the moving dot turns to green.
Now, concentrate 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 green dot rotating.
Haii hope this works!
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