The "tunnel" gets wider as the fingers move further from your focused object, and narrower as they move closer to it.įinally, just move your head slightly right to align your focused object with both your fingers. Now move either finger (or both) closer to your face. They will form a sort of converging "tunnel". Yes, both fingers get doubled, so you see 4 fingers in all. Now start focusing on other further objects, while using your fingers as a sort of rifle sight.
Now move your head to the right until the fingers align again. If you close one eye in turn, you will be able to see which eye is responsible for which image. You will also see another close finger way to the right. You will see the far finger "through" the left close finger. Now, while keeping focus on the far finger, move your head to the left (only the head, not the hands). If you close one eye and then the other, you will notice that the "fake" left close finger is see by the right eye and the "fake" right close finger is seen by the left eye. When you focus on the far finger, the close finger will appear doubled. If you close one eye and then the other, you will notice that the "fake" left far finger is seen by the left eye and the "fake" right far finger image is seen by the right eye. When you focus on the close finger, the far finger will appear doubled. Here's how that looks (your eyes are the blue blobs. Now switch your focus from one finger to the other. Keep the other finger at half the distance. Keep the left arm straight, so that the finger is at arm's length from your face. To see parallax in action, hold both hands in front of you, with the index fingers up. People with vision in only one eye can not see in 3D, although they can mimic depth perception by moving their head slightly, creating a sort of "motion parallax", to figure out which objects are closer (they seem to move more) and which are further (they seem to move less) Your brain does the magic of filtering this information and presenting you with a 3D image. Everything that you see is a mix of two images, one coming from your left eye, and one coming from your right eye. In short, you have two cameras: your eyes. through the viewfinder and the lens of a camera." Parallax = "the effect whereby the position or direction of an object appears to differ when viewed from different positions, e.g.
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