《淮南子·齐俗训》
竹子的特性是能浮于水面，但一旦被砍削成竹简，捆成一束扔入水中，就会沉下去，这是因为经过砍削破坏了竹子中空的特性。金属物入水便沉，但将它们放在船上，有船依托就会随船漂浮水面，这是因为金属物有了船的依托所致。
由此观之，衣服礼俗者，非人之性也，所受于外也。夫竹之性浮，残以为牒，束而投之水则沉，失其休也。金之性沉，托之于舟上则浮，势有所支也。
The nature of bamboo is to float on the water, but once it is cut into bamboo slips and bundled together into a bundle and thrown into the water, it will sink. This is because the cutting and cutting destroys the hollow nature of the bamboo. Metal objects sink into water, but when they are placed on a boat, the boat will carry them and they will float on the water, which is because the metal objects rely on the boat.