If your eyes follow the movement of the rotating pink dot, you will only see one color: pink. If you stare at the black + in the center, the moving dot turns green. Now, concentrate on the black + in the center of the picture. After a short period of time, all the pink dots will slowly disappear, and you will only see a green dot rotating. It's amazing how our brain works. There really is no green dot, and the pink ones really don't disappear. This should be proof enough; we don't always see what we think we see.
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