FIGURE 5.3 Sensory adaptation: Now you see it, now you don’t! (a) A projector mounted on a contact lens makes the projected image move with the eye. (b) At first, the person sees the whole image, but soon it begins to break into fragments that fade and reappear.
(From “Stabilized images on the retina,” by R. M. Pritchard. Copyright © 1961, Scientific American, Inc. All Rights Reserved.)