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- There is a hole at the connection between the head and the bottom of the cup. When water is poured into the cup, if the water level is lower than the upper end of the porcelain tube, the water will not leak out; when the water level exceeds the upper end of the porcelain tube, the water will leak out through the leaking hole at the bottom of the cup
- This leaking cup is called "fair cup" by the Han people. It is made according to the siphon principle in physics. The fair cup is the most fair for holding wine. When holding wine, it can only be shallow and not too full, otherwise, all the wine in the cup will leak out without a drop left
