In fact, Kanyu studies architectural geology, architectural geography, architectural meteorology and so on, and studies the relationship between man and nature. Its core idea is to pursue the unity of man and nature and the harmonious coexistence of man and nature. It is one of the precious cultural heritages in China.
Later generations deliberately mystified and formalized Kanyu, forming the so-called "Feng Shui" in later generations, which contains a lot of superstitious elements, and many of those stylized things are feudal dross.
A compass is actually a compass. The dial of the compass is "southeast and northwest", and the surface of the compass is "gossip" and other words.
I personally feel that there are two situations:
1, human factor: intentionally or unintentionally let the compass fail;
2. Abnormal magnetic field: There should be a strong electromagnetic field or ferromagnetic substance nearby! The landlord tried to turn the compass to see if the direction of the pointer had changed. If the pointer rotates relative to the compass surface, but the direction remains the same, and the north-south direction is unknown, it indicates that the magnetic field is abnormal; If the pointer follows the compass, it means the compass is broken.