To put it bluntly, Feng Shui mostly involves an environmental science. Many geomantic omen will mention that there is spirit in the tangible. On the basis of convenient home transportation, elevators will also cause certain security problems, such as the stack effect problem caused by the empty stairwell. Noise problems during operation. Let it go with the magnetic field problem. If you are in an unreasonable position in some homes, it may be unfavorable to these homes. You can imagine what might happen if the brain hole is wide open. Only feng shui masters can use terms like "white tiger opens". To put it bluntly, I just don't want to show people in words that are easy for the public to understand, and speak in mysterious ways to increase the mystery.
Another example is cross flow, which is just an airflow problem (gas field) caused by the environmental pattern. Air flow directly through the entrance door from the opposite direction will of course cause physical disadvantages to the residents, especially in some directions. Secondly, the issue of privacy. People can see to the end, and all their privacy is exposed. Therefore, it is necessary to set up a porch, not just to block the direct wind and cover it to prevent privacy from leaking.