![]() ![]() You can experiment with more lines of text and you can try various If you have done this correctly, when viewed in 3-D you will see that you have brought LOVE to the front and pushed HATE to the back. You should have something like the following: Leave a blank line and then enter a word (such as "LOVE") several times with the words separated by 8 spaces. Leave a blank line and then enter a word (such as "HATE") several times with the words separated by 10 spaces. Near the center of the page, enter 2 asterisks separated by 10 spaces. You do not need the asterisks, but it is easier to view the stereogram if you have the asterisks in your text. If you want to make a stereogram using only letters, you can make it using a text editor on your computer and then printing the resulting text. Method above with graphics instead of letters. The following picture illustrates a 3-D picture using the first We can actually make the above using pictures of ants, bees, and flys. In this example, the ANT's are separated by more space than the BEE's, and the BEE's are separated by more space than the FLY's. If we make them closer or further apart than the A's we can trick the brain into thinking they are nearer or farther. We don't have to space the B's at alternately different separations. (Note: If you are using a browser that allows you to change the font size, the 3-D effect will probably be easier to view using a small font.) The brain tries to interpret this as one B at a nearer or farther distance than the A's. What is happening is that one eye sees one B and the other eye sees an adjacent B slightly offset. You can see that the A's are spaced at equal distances (10 spaces between them) but the B's are alternately spaced: 11 spaces then 9 spaces. The A's appear to be in the middle level and some of the B's are in front of the A's, and some of the B's are behind the A's. You should see what appears to be three levels in the scene. Then slowly move away from the monitor so that the combined image comes into better focus. Consider the following chart:īring your eyes close to your monitor such that each eye sees the two asterisks separately move your eyes until two of the four asterisks are superimposed so that you see three asterisks. You can make your own 3-D pictures fairly easily. Then the dots are placed in a single image with the corresponding dots placed an appropriate distance apart so that when viewed, the brain "sees" a three dimensional image. Object that is very close to our eyes, we say that it causes us to be cross-eyed.) In the case of the Magic Eye, the images are broken down into a series of dots. The Magic Eye takes advantage of the fact that a normal person causes their two eyes to converge at different angles depending on the distance of an object being observed. Two pictures are made of the same scene with a camera with two lenses or with two different cameras (or two pictures made by the same camera in different positions.) The lenses, cameras, or positions are usually separated by what is called the interocular distance (the distance between the centers of an average person's eyes.) Then when you view the two pictures it is as if you are viewing the actual scene. ![]() Both of these devices use the same principle. Younger readers are familiar with the Viewmaster that you can buy today. Older readers will remember the stereopticons that people and schools used in the last century and the first part of this century. We have had the capability of viewing flat pictures in 3-D since the stereoscope was invented by Sir David Brewster of England in 1849. Interpret the two flat images into a three-dimensional one. The brain, through experience, has learned to Each of our eyes sees a slightly different picture of the scene viewed. In the real world, we use our binocular vision to perceive distance. In the 1960's, a psychologist, Bella Julesz made 3-D pictures with apparently random dots to see if people could perceive distance without any clue such as size. Materials needed: Your computer (or alternatively, just a typewriter), paper, and your imagination.ĭo you like to look at the Magic Eye (Copyright N.E.Thing Enterprises) feature that appears in some Sunday comics? (The Magic Eye is called a "single image random dot stereogram".) Do you wish that you could make one? Do you wish that you understood what is going on? Well, I can't explain it rigorously (and you wouldn't want me to), but I can give you a rough idea how these work and how you can make your own. Make your own 3-D stereograms MAKE YOUR OWN 3-D STEREOGRAMS ![]()
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