2. From the perspective of geomantic omen, the five elements of Qin changed from "gold" to "wood". When the piano is working, the five elements belong to "gold"; when it is still or out of tune, the five elements belong to "wood". According to the relationship between the five elements, Jin Shui Mu makes a fire, the north represents water and the south represents fire, so the piano is suitable for the north or south of the house.