FIGURE 6.5 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) Initially, the person sees the stabilized image—but soon, thanks to sensory adaptation, the eye becomes accustomed to the unchanging stimulus. Rather than the full image, she begins to see fragments fading and reappearing. (From “Stabilized images on the retina,” by R. M. Pritchard. Copyright © 1961 Scientific American, Inc. All rights reserved.)