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Actually, there are no color spots at the intersections. All those light color spots you may see are appearing because of different surroundings of different points at white horizontal and vertical roads going across every grid.
A bright surround causes that a point looks darker, and vice versa; this is so-called lateral inhibition. In our cases every intersection is surrounded by four bright areas what makes it darker. At the same time any other parts of the roads are mostly surrounded by dark squares what makes these parts lighter. This effect is different depending on whether you stare at any intersection, or see it by your peripheral vision.
The three grids above are very similar to the previous ones, but they have REAL light color spots at every intersection. In this case the lateral inhibition effect is weak. |
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