Why is Japanese tea set called eggplant?

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Japanese tea set: eggplant, named after its similar appearance.

Eggplant is the name of a tea set with a specific shape. The tea set of Japanese tea ceremony is a small pottery pot for making strong tea, which belongs to "drinking tea".

According to different shapes, the "tea entrance" can be divided into "Shouchong", "Eggplant", "Haihu" and "Wen Lin".