![]() ![]() Practice Viewing Some Photographic Stereograms.A Middle School Class Handout on Stereograms (PDF).Why Do Stereograms Produce the Perception of 3-D Images?.Why Are Some People Unable to See Stereograms Properly?.A Selection of Photographic Stereograms.Stereograms and Other Optical Illusions with Solutions.A History of Stereoscopes and 3-D Images.Examples of Old-Fashioned Stereoscopes and Related Devices.What Are Stereoscopes and How Do They Work?.Optical Perception and the Effect of Stereograms.View Some Stereograms with Special Effects.A Quick Introduction to Autostereograms.Build Your Own Stereograms with an Online Generator.Stereograms with Randomly Generated Patterns.Step-by-Step Instructions for Viewing 3D Stereograms.Learn to Create a Digital Stereogram On A Computer.K 3-12 Lesson Plan on Optical Illusions and the Brain (PDF).An Explanation of Stereogram Viewing Methods.Now have a look at the following resources to learn about stereograms, and then see try a few examples to see how easily the brain can be tricked. Remember to take a break after every couple of pictures so that your eyes and head don’t hurt. As you practice, you will notice that you are able to find the hidden images more and more easily. Viewers typically stare at the center of the image with their eyes unfocused for several minutes before noticing the hidden 3-D picture. One way is to put your nose to the stereogram, and with your eyes crossed or unfocused, move back away from the image slowly. Viewing stereograms properly sometimes takes a bit of practice. When viewed with 3-D glasses, the pictures combine in our brains to form a three-dimensional effect. Some stereograms combine two overlapping images that are in shades of red and blue respectively. Autostereograms are made digitally with computer software by layering two images over each other. When a viewer stares at them for a very long time, a clear 3D image appears from beyond the mess! Although we also refer to these images as stereograms, they are actually autostereograms since they only comprise of a single image. A related example is the types of two-dimensional images that contain a scrambled jumble of messy, confusing colors. Originally people had to use a device called a stereoscope to see the final image. When you view them together, they seem to overlap and form a three-dimensional image. A stereogram uses two similar side-by-side images that are adjusted slightly different for each eye. One type of optical illusion is known as stereograms. However, if we perceive a 3-D train rushing right at us, we automatically flinch or duck! When we watch a 3-D movie, we know that the actors and special effects are not really there in the movie theater. ![]() As the brain tries to process the information as best as it can, it is sometimes fooled into creating an output that is untrue in real life, but it makes the most sense to us. For example, if we saw a man with three legs, we’d probably rub our eyes and think that we’re not seeing correctly! Optical illusions use certain techniques that manipulate shapes, depth, color, and perception, to trick our brains. When we receive information from our eyes, the brain tries to match it with something that it knows is true. They seem like one thing at first, but after staring hard enough, the image seems to change right before us! Ever wondered how that works? These types of visual tricks are called optical illusions. We’ve all seen those games or puzzles that seem to play tricks on our eyes. ![]()
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