Mencius said, "If you lose your son and don't know the reason, you can't be round if you don't follow the rules." Li Lou is a legend with very good eyesight. He can clearly see the end of a hair from a hundred paces away. The loser is Lu Ban, and the compass refers to the compass; The moment is a square folded at right angles. Mencius means that even with Li Lou's eyesight and Lu Ban's skills, you can't draw a circle or a square correctly without compasses and rulers. The so-called "no rules, no Fiona Fang" means that everything needs to follow certain standards and laws.

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