yes. In the Book of Changes, coal can't be placed at the gate, because "coal" belongs to "yin"; And the gate belongs to "Yang". Therefore, putting coal at the gate will lead to disharmony between Yin and Yang. However, with the development of economy and the increase of population density, the "Yang" is greatly aggravated. Therefore, it is ok to put coal at the gate. It just affects environmental sanitation. However, with the development of economy and the increase of population density, it is also possible to put coal at the gate. The Book of Changes is the product of ancient civilization, and it is a highly philosophical work integrating natural science and social science in China. The Book of Changes is divided into three parts, Lianshan and Guizang in the Emperor's era, and Zhouyi in the Qin and Han Dynasties, which are called "Three Changes" together (another said that all three books were written in ancient times). In ancient times, people set astronomical phenomena, observed astronomical phenomena, gave time, created calendars and easy books, etc., and civilization began.
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