With the rapid colored afterimage illusion in particular, the viewer will notice a circle of magenta dots -- one of which disappears briefly -- rotating around a circle. While there is absolutely no green in this circle of dots, with good fixation, the viewer will begin to see a strong greenish color whenever the magenta dot disappears. Eventually, it will appear as though there is a rotating green spot.
But that's not all. If the viewer's gaze is really steady, all of the magenta dots will disappear, leaving nothing but the rotating green spot.
Here is the website it is from...
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