An amazing illusion! And the last sentence is so true…
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.
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.

Optical Illussion