A circle that's supposedly there disappears! A light that's supposedly not there shines! This program focuses on such visual illusions. When a hard pencil is quickly swung like a seesaw, it looks like rubber. The secret lies in our limits of "eyesight". The program also introduces the visual illusions we see when our brain perceives "depth". When the picture of a crater is seen upside down, it looks like a dome. Our preconceived knowledge that sunlight shines from above affects our visual perception. This episode takes the viewers into the wonderful world of visual illusions.