You have much to say against the use of mirrors in McFengshui. You suggest reading books by Eva Wong.

Eva Wong’s website says

Pa-k’ua Mirrors

• When a neighbor’s driveway points toward your front entrance, counter it by affixing a pa-k’ua mirror to the door. Pa-ku’a mirrors are usually available at Chinese gift stores.
• A pa-k’ua mirror can also be used against sharp, pointed objects directed at your house—for instance, TV antennas, protruding tree branches, or spiky architectural features.

So should Eva Wong be added to the list of quacks?