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It’s impossible - as soon as you focus on
the black dots, they disappear!
Your eye and brain have very special
mechanisms for seeing edges clearly. This allows you to see a sharp boundary
between an object (e.g. a person or a building) and the background.
Your mechanism for sharpening edges is
called lateral inhibition. It works by the light-sensitive receptors in your eye
switching their neighboring receptors off. This makes an edge look more
pronounced.
Scientists do not understand exactly why
you see the black dots, but they think it has something to do with lateral
inhibition.
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