What is the "28 essentials" in Feng Shui?

Geomantic terminology. One of the nine songs and ten tricks of Feng Shui is about the twenty-three requirements of dragon, cave, sand and water. Feng Shui experts say that you can read this song and quote it endlessly. Its song says:

Dragons should flourish and rise and fall;

The pulse should be thin and the point should be hidden;

The ins and outs must be true and the bureau matters;

The hall should be clear and flat;

The sand should be clear and the water should be condensed;

Mountains should be surrounded by water;

The dragon wants to sleep, and the tiger wants to be low;

The case should be close and the water should be quiet;

Before the official, the room is full of gods, but also to the pillow music, and the two sides are pressed;

The water should be handed in and the nozzle should be closed;

Acupoints should store wind and gather qi;

There is no shortage of eight countries and no diarrhea in Luocheng;

There can be no concave mountain, and the water will not jump back;

The hall should be straight and the mountain should be high.