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Why do illusions trick the human mind?

Updated: 8/18/2019
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Information from the human eye is actually sent to the brain and processed there. The eye itself is just an information collection system. The human brain is not an infallible device, there are some things that it processes incorrectly and some things that it does not process well. For example, your brain will try to interpret in 3 dimensions, that's how we are built to percieve the world. Two dimensional optical illusions take advantage of this, using repeating paterns and two dimensional drawings that can be percieved from more than one angle. In order to understand this, just draw a translucent cube on a piece of paper. Either square can be the front of the cube, if you concentrate, you should be able to switch which one is the front and the back. You won't be able to look at that drawing and see the lines for what they really are, your brain will make you see it in 3D. If you repeat this kind of illusion many times on a piece of paper, you can trick the eye to see complex 3D images. Illusions that require the "3D glasses" take advantage of the same mechanism, but do so in a different way. I'm unsure of the specifics on that particular type of optical illusion.

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Q: Why do illusions trick the human mind?
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