In order to see these stereo pictures, you should move your head in front of the two pictures, shown here side by side. You should let your eyes relax, so that after a few seconds, your left eye should start seeing the left photo, and the right eye the right photo. Slowly move your head back until you are about 20 inches (50cm) away from the screen. Slowly there will appear three photos, the middle one is the stereo image. Not everyone can relax their eyes, but once you do it for the first time, the second time is much easier! A very helpful trick is to place a black piece of hard paper, 6 inches long by 3 inches high, vertically on the screen (the longer side on the screen) between the two pictures.