What are the characteristics of physiognomy after Wei and Jin Dynasties?

Its characteristic is that the choice of burial place is paid more and more attention, and most books about it are named after Funeral Book. Geomorphology at this stage not only inherited the theory of Yin-Yang and Five Elements, but also attached great importance to investigating the situation of mountains and rivers, paying attention to the orientation, back and arrangement structure of palace tombs. Among them, the investigation of the situation of mountains and rivers is the most subtle, involving the position, trend, rise and fall of mountains, streams and trees, especially the so-called "qi" This is also the reason why rural residents in China attach great importance to the geomantic forest in front of the village and behind the village.