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Mencius said: “Even with Li Lou’s sharp eyes and Gongshu Ban’s (Lu Ban’s) superb craftsmanship, without compass and square, one cannot draw perfect circles or squares. Even with Shi Kuang’s acute hearing, without the six pitch standards, one cannot tune the five notes correctly.”
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“I am seventy already,” said Duke Ping of Jin to his blind musician Shi Kuang. “Though I want very much to study and read some books, I feel it is too late.”