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What you see is not always what you get We learn to perceive or understand what were looking at and we get used to how things are supposed to be Sometimes our brains get the clues all wrong Other times our brains fill in the missing pieces Our brains cause optical illusions in both waysThe optical illusion you see the most is probably television TV doesnt really move Television is really lots of still pictures that are shown to us very quickly Our brain puts the images together because it has learned to expect the movement and it cannot look at that many still pictures one right after another that quickly so it makes it a whole movement Another very common optical illusion is the computer monitor When you look at a computer monitor you see many different colors That too is an optical illusion There are only three different colors that merge in together to make all of the colors that we see The three colors are red blue and green The only way to see the colors is by looking really close at the screenFor an illusion to work it is all in the eye First light enters the eye through the cornea From the cornea it goes to the pupil The amount of light passing through is made normal and fixed by the iris the colored part of your eye Next it passes through a fluid This fluid is what keeps the eye round It is called the viterous humor Then it reaches the retina where it appears like an inverted picture The optic nerve then sends the picture to the brain and you see what you are looking at however the brain can take this picture and add things to make the picture something that you have seen or are accustomed to seeingIllusions also have to deal with the way that people think Many people think more actively with the left
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