Northwest China is called "Tianmen" in geomantic terminology, which means father, dominator and ruler. In the practical application of geomantic omen, this position is usually used as a deity, master bedroom and so on.
The east is the direction of sunrise, symbolizing the position full of yang and vitality in Feng Shui. In traditional geomantic omen, there is a saying that "purple gas comes from the east", which means that the east is full of yang. Because this position symbolizes life and is also a place to release the sun, the sudden extension of the house is a good sign, and it will certainly develop, prosper and achieve something, while depression is a bad sign.