


Moving the first towards and away from you will create the illusion of movement, the second shows an example of retinal fatigue, staring at the cross in the centre of the box, the dots will start to disappear. Finally click on the third to see an example of an afterimage, which is a visual impression that remains in the retina after the initial stimulus is removed. The afterimage always has colours that are complementary to those of the original image. Look steadily at the cross in the centre of the picture.
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