Houses facing the piedmont or the valley mouth are not only difficult to live happily, but also prone to various diseases. The so-called front of the mountain end refers to the area that stops under the inclined plane of the mountain end and is connected with the flat land by steep slope.
The valley exit, that is, the narrow valley between two mountains enters the gentle part of the flat ground. If it is in a vast plain, there will be rivers flowing through it. People living in these two terrains are always in danger of being attacked by floods and landslides.
The above terrain is called fan-shaped terrain in geography. Once the rapidly descending narrow valley stream enters the flat land, its velocity suddenly slows down, so the sediment brought by the stream is deposited at the mouth of the valley. Especially in the flood season, a large amount of sediment caused by landslides falls with the flood and accumulates at the outlet of the valley, forming new land.
However, if we go back and create floods and landslides on this fan-shaped land, we don't know when it will come again, so the danger will never be eliminated. Whenever heavy rain comes, people living in these areas are bound to be on tenterhooks. If the heavy rain lasts for a long time, it is difficult to ensure that they will not get sick.
Safety is the initial motive of China's geomantic omen. A main thread running through Feng Shui theory is the idea of ecological security and environmental choice, which has a long development process. In the Paleolithic Age, human beings just instinctively chose a safe living environment and were forced to find a place where they could avoid natural disasters and have rich food resources.
This is a subconscious environmental choice. The gradual transition from subconscious choice to conscious choice has gone through millions of years in Paleolithic Age. In the Neolithic Age, people have accumulated some knowledge about the choice of environment, such as: the basic choice of living place is the platform or terrace by the river; Or the topographic part of a meandering river; Or near the mountain and water, where the lee is sunny; Or on the mound of the plain in the lower reaches of the river; Or on high mounds along the coast. At this time, people's choice of environment is mostly conscious choice, and they have a certain degree of safe environment choice thought.