It can play a certain role in spacing, which is generally found in regular buildings. There are some pictures on it, which probably means positive or something, and there are links.
There are different opinions about the function of yingmenqiang. To put it bluntly, the inner courtyard will not be unobstructed by outsiders, which is also in line with China's ancient concept of hazy beauty. In addition, in Feng Shui, the door is the entrance of "Qi" and the foundation of wealth and prosperity. Being strong at the door can gather this kind of "qi" and restrain it.