Cheshire Cat illustrates some of the things that can happen when each of our eyes sees a completely different image. At this exhibit, visitors look through a viewer at a friend’s face with one eye while the other eye looks at a mirror on which is reflected a white screen off to the side of the exhibit. By sweeping a hand quickly over the white screen, the eye looking in the mirror sees the motion. Motion is one thing that grabs the brain’s visual attention; this distraction causes the viewed friend’s face, or parts of it, to momentarily disappear. The eyes and smile will usually be last to disappear.