Adjacent objects can influence how you see things. Illusions deceive us for various reasons. This is just one of countless examples of the eyes playing tricks on the brain. You see the dark blobs in the white spaces, but when you stare right at the spot where the blob should be, it disappears because, in fact, it was never there to begin with. This grid is one of the most classic examples of an optical illusion, where your mind is being tricked into seeing something that's not there. Now look again at the white space in the "street crossings." Although this image, known as the Hermann Grid, is really just a black and white grid of squares, it appears as though there's something more – little grey discs, or blobs of darkness, in the intersections of the white lines. What do you see? A grid of squares? Great.
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