Well, consider this sentence: "I saw a hairy bald man" Putting aside punctuation and word order for a minute ("I saw a bald, hairy man" would be the more regular form) as written, the sentence is at first almost certain to puzzle. The oxymoron "hairy bald" is stark and causes the mind to come to a juddering halt. You can't help but stop to ask yourself, "Eh? How can a bald man be hairy?"
However, when you think about it, you realise eventually that a man can be hairy in places other than the top of his head. For example, he might have a hairy chin, or hairy arms and legs. He might have a hairy chest. When you realise this, you see that it is possible for a man to be both hairy and bald.
So, a phrase which at first seems to contradict itself later proves to be okay. We call such phrases 'oxymorons', and "hairy bald" is an excellent example of one. At first we thought the phrase was nonsensical, but later we came to understand that it actually made sense.
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