When you go to watch a 3D movie, you are asked to wear special glasses. These glasses perform the same function that your eyes do. The 3-D glasses feed different images into your eyes .The screen actually displays two images, one in red and the other in blue (or green) and the glasses cause one of the images to enter one eye and the other to enter the other and your brain does the rest.
Alternatively, two synchronized projectors project two different views onto the screen, the glasses allow only one of the images into each eye and the brain correlates the two sets of images, to create the 3 D effect! It is this effect that gives the sense of depth making objects appear to be coming "out of" the monitor.
You could even try taking a 3D picture with your own camera. What you do, is take two pictures of the same object by shifting the camera horizontally about 2½" (65mm) . A smaller shift is used for close-ups and a larger shift can be used for distant subjects. Alternatively, use two cameras and take one photograph with each simultaneously. Remember, this will work only if the object you are taking a picture of, is stationary. After you get them developed, place them together, and you will see a 3 D effect!!
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