What are the taboos of geomantic omen in the basement?

The basement or semi-basement is located underground, which leads to the decline of yin and yang and the lack of popularity.

This is similar to "there are fewer people in the house", because the popularity is scarce, and the house often makes up for it by grabbing the energy of the occupants.

So living in an unpopular house often leads to loneliness, especially in the basement.