Here's the URL for an optical illusion. http://kids.niehs.nih.gov/games/illusions/illusion_15.htm If we look at the white spaces between the black pieces, we seem to see the word 'LIFT.' But the letters are only partly there; our brains complete them visually. In the same way, our brains may create sounds which are not actually there, and we call that tinnitus. On the other hand, taking a lot of aspirin can cause the ears to ring, too.
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