The 10th day is believed to be the birthday of the God of Stone which played a very important role in the agricultural society of ancient China.
On this day, people are forbidden to move any stone, including stone rollers, stone mills and herb grinders, and should not cut into a mountain for rock or build a house with rocks, otherwise bad things will happen to the crops.
People also burn incense and candles for the stones and offer pancake to the God of Stone.
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