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                         An Opposite Example

        An  aesthetics  professor's  grandson  asked  his  grandfather, " Grandpa, why did you say that all the falses are ugly?"

        "That's certainly true . Couldn't you give me an opposite example?"

        "Oh, yes," the grandson,  climbing on his grandpa's knees , said proudly, "Look  at    yourself. When you put on your false teeth, you  looked younger and lively; when  you get them off, your mouth looks empty and shrivelled, that's really ugly. Isn't it an opposite example?"

        The professor could find no answer.