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A Concave Bagua mirror is the opposite of a Convex Bagua mirror. Concave Bagua mirror used for absorbing auspicious Chi and Convex Bagua mirror used for reflecting killing or inauspicious Chi.
If your doors or windows facing a nice landscape such as round top hill where the trees are green and blossom, grand pasture where the view makes you comfortable, or a horizontal road where the traffics are slow or a curved road surrounding your house, then you should place a Concave Bagua mirror on top of your door or windows to absorb the auspicious Chi from the environment to enhance the auspicious Chi of your house.
If the main door of your house is facing a staircase or road which going down from your level to the lower level, you should place a Concave Bagua mirror to prevent auspicious Chi from slipping away from your house through your main door.