Under the Rock and Soil

The Book of Changes of Yin Zhai said: "If you don't bury the Yanggang, you won't bury the Yinzhai, the Qi will be dispersed by the wind, and it will stop by the boundary water." This ridge of soil is neither high nor steep. It hides the wind and collects air. Weeds grow on the surface, surround it, and are sparse in the middle. This is the characteristic of the rammed earth of ancient tombs, which is the most standard appearance of old tombs.