Traditional Culture Encyclopedia - Traditional stories - Why should the sewers of ancient buildings be designed as copper coins?
Why should the sewers of ancient buildings be designed as copper coins?
The diameter and length of the first round manhole cover are the same, so it can be put in no matter how it is rotated, and it will not fall off. If it is a square, its diagonal length is 1.45438+04 times the side length. If you pick up the manhole cover and put it obliquely, it is easy to fall off;
At the same time, the circle looks good ~
2. The copper coin pattern is a symbol of wealth and a good symbolic meaning.
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