Bagua Mirrors are used to protect a house or building from harmful energy which may attack the occupants. They can also be used on the front doors (outside) of offices and shops to deflect negative energy that may be coming from the sharp edge of an adjacent building, tree trunk, tower, angle of a roof line or other offending structure facing the front door. This eight sided symbol is very beneficial as its power comes from the trigrams arranged on each of the eight sides. Be sure, however, that they are only used on the outside of the front door of your house, office or retail store, and they should be positioned to be facing away from the inside of your space.