What is the saying of the tortoise shell?

What are those things on the desk of ancient fortune tellers in China?

They are all used for divination in Zhouyi. Tortoise shell indicates spirituality (accurate fortune telling). The ancient Zhouyi divined that tortoise shells were roasted and burned, and the good or ill luck was determined according to the cracks. Tortoise shell is called the first choice of the ancients because of its long life and spirituality. As for bamboo sticks, they are just tools for divination. Some people write good and bad luck on bamboo sticks, but the accuracy is doubtful. Other hanging pipes, wooden grids, copper coins, etc. It is also a necessary tool for calculation.