Still on mirrors, I would like someone to give a method of using mirrors to ward off negative influences and activities in the environment at large, starting from our homes.
In general, my experience with using mirrors involves either a) scrying techniques; or b) evocation rituals. If you get a good look at the Lesser Key of Solomon The King, there is a diagram for a circle which has a triangle outside of it. This triangle is called The Triangle of Arte. In the diagram, there is a circle inside the triangle. The common thought is that this circle is where the mirror is placed during an evocation.