Bagua mirrors like the one above are often used as feng shui cures. Ideally, they should be reinforced with the 3 Secret Reinforcements by a qualified feng shui expert and it’s essential that they are placed correctly. (Feng Shui By Fishgirl can help you with this.)
This special mirror is NOT meant for indoor use! It should only be placed inside your space if it is in a window facing outward to deflect negative energy away from the space.
If you have a building across from you that is dominating yours, a good solution is to place a bagua mirror over your doorway to repel the dominating chi. Other uses? Place the mirror outside facing a disruptive neighbor’s building. Or to repel the energy coming from an electrical power line or other large structure.