Nothing to say. It doesn't matter if the hall is empty. Because the entrance of the hall accepts the external Qi of nature, the dragon Qi of the earth veins rises from the bottom, and the external Qi and the internal Qi merge to form a shadow that appears for future generations.
There are ancient and modern examples and calligraphy: in some parts of the Yin Mansion, if the dragon brings evil energy, it is necessary to leave space under the bones to relieve the dragon energy.