Feng shui Concave Bagua (pa kua) mirror is a mirror which is surrounded by eight trigrams octagonal shaped wooden frame and a hanging hook provided on the back of the frame. It is said that this Chinese amulet removes all negative bad energy coming from your bad neighbors, bad evil eye, bad luck(curse). As per feng shui Bagua mirror Vastu placement - It should be placed outdoors means above the front door or above a big window that is facing outside not place indoors. The Bagua mirror is properly made a wall hanging instrument which also deflects unwanted influences indoors and gives bad eye protection for the home. The concave mirror that's curved inward. It is used to magnify the positive chi. These mirrors reverse negative energy or chi flow and expand positive energy flow in the house, shop, office or business.