2. This is an idealized environmental model. In real life, as long as the terrain or building behind is higher than the front, the terrain or building on the left is higher than the right, and the hall in front is open, this environment has the conditions to hide the wind and gather gas.
3. In geomantic omen, concealed wind refers to the proximity of building objects around the house, which can protect the house from being blown away by the outside wind.
4. Cohesion means that the airflow entering the room can be gathered in the room, so that it will not be easily lost. At the same time, it can avoid harmful wind and harmful gas, while houses that hide favorable wind and favorable gas are called "houses with hidden wind and gas"