Visual Illusion Brain Test: Find the Number in Seconds With Your Sharpest Vision! 

There are a number of interesting visual phenomena known as optical illusions. 

These phenomena test our vision and use the brain to perform tricks.  

One sort of optical illusion that is rather prevalent includes changing shapes, colors, 

and patterns in order to produce an image that is distorted or in some way misleading. 

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When viewed in close proximity, this can cause visuals to give the impression of moving,  

changing size, or even revealing components that were previously concealed. 

Artists and scientists alike have been captivated by the potential of optical illusions, and they have utilized them in a variety of activities,  

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