In geomantic omen, it is emphasized to "hide the wind and accept the gas". If you open the door back and forth, it will inevitably lead to the air entering the house can't stay and can't go with you. This will lead to poor housing and no money left.
Realistically speaking, China is located in the northern hemisphere of the earth. Houses in China usually face south, so that warm fresh air can enter the room. The back of the building is located in the north, which can prevent the cold air from the north from entering the house without opening the door on the back, thus maintaining the indoor temperature. It can be seen that China's geomantic omen is not imaginary, but a law constantly summed up according to the objective laws of China's physical geography, which is a concrete manifestation of respecting and utilizing nature and doing things according to objective laws.