Feng shui, that is, some kind of taboo. China people have specific taboos of China people, foreigners have specific taboos of foreigners, and all ethnic groups have specific taboos of all ethnic groups. The specific taboo of China people is called Feng Shui, and the specific taboo of foreigners is not necessarily called Feng Shui, but it does not mean that foreigners do not have specific taboos. Taboos are caused by many factors, such as customs, views on something, taboos on certain animals and plants, taboos on certain words, cultural meanings and implications. For example, there can be no "trees" and "people" in the walled yard explained by the word "sleepy" and "prisoner", which is a typical joke; Doors and windows should be small, but not too big, which is a taboo custom evolved from the lack of wood; Red evil spirit is a ban evolved from some animals' special fear of red; The head of the bed should not face west. It comes from the Buddhism and Taoism culture that "death is liberation, and death in the west is the destination of death", and so on. Other appendices of this ban exist around this ban and further explain it ... and so on.
Taboos, some of which are reasonable and scientific, and some of which are customized, do not mean that they are all reasonable and scientific.