What is the sand in geomantic omen and what is its function?

The meaning of sand generally refers to the mountainous areas such as sanitary cave (building base), which is a hill attached to Lailong. Generally, it is low hills or hilly terraces. In the ancient military, the mountain model-sand table was built with sand, and the ancients called the hills "sand". "Notes on Geography and Personnel" said: "The sand maker was given by the ancients, and the mountain shape was made of sand piles, so it was named Sha Er. "In the pattern of feng shui, sand refers to the front, back and left.

The mountains (villages or single buildings) around the city have the respect of TEDA and the backwardness of the city, which is a master-slave relationship. For example, the relationship between dragon and sand and the environmental landscape image of sand in "Mysterious Young Women Capsule Cape Sutra": "The dragon is the monarch and the sand is the minister; The monarch must go up and the minister must go down; Bow your head and walk without losing your temper; The exhibition is strange, and there are auspicious images in the column; Far away, the capital is Guo, and near, there are several cases; Eight winds are guarded by it, and the water mouth is closed by it. "

The Book of Changes says: "One yin and one yang is the Tao", which means that the operation of one yin and one yang is the Tao. Laozi said: "Everything is negative and holds Yang, and it is harmonious to rush." This sentence means that yin and yang are unified in two aspects of things. Because they change endlessly, the harmony between them is conditional, temporary and transitional, so it is relative. Taoism takes "harmony" as its purpose and "harmony" (balance) of all things as its truth, and "balance" is the final state of stability.