The age of the building also comes into play. Different years have different potential effects on the inhabitants personal energy and circumstances. When problem areas of the home are found the chi of the area can be enhanced with various cures. Mirrors guide, direct and enable ch'i to flow. They can also be used to counter negative influences.
Crystals are another common cure.
They are used to alter the flow of chi in windows, hallways or any area of the ba-gua. They are used as a substitute for a wind chime or a mirror. The bamboo flute represents peace and safety. Properly hung flutes can lift any oppressive element. They can be hung over doorways to counteract negative influences.