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Look carefully at this image and count the black dots that you can see on the grid.
You will notice that when you focus on a single dot, it turns white. The black dots appear around your area of focus, not within it. This is because the brain is affected by the dominance of the black squares and thinks that the dots must be negative. In fact, none of the dots are black, they are all white.
This optical illusion is used sometimes in schools, to see how effectively children cope with focus and concentration skills in a learning environment.
Count the black dots...
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