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In a simplified model, the eye could be seen as an input device, similar to a computer's keyboard. Using this analogy, the mouth could be seen as an output device similar to a computer's sound board, with the brain being the equivalent of a central processing unit.

The eye reports input information to the brain, which processes that information and decides on a suitable response for an output. For example, the eye reports sights of a juicy steak, and the mouth speaks the words please may I have this juicy steak.

In the next step, the mouth acts as an input device. While computers have many combined input / output devices (such as a CD-ROM drive, for example), nothing really accepts and digests physical input in the same way a mouth eats the steak.

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