Concave mirror plays a unique role in geomantic omen, but it is mostly used outdoors. Excuse me, Feng Shui experts: Can I use concave mirror indoors?

Concave mirror's principle is that he can put distant images into the mirror, so he can only put them outside the door or outside the window. If placed indoors, it will bring air into the room.

Concave mirror, because of its focusing principle, is aimed at the form and evil in the distance, and has never heard of using concave mirror to eliminate evil indoors.

The indoor terrain you mentioned is not suffocating, but the terrain is divided into high and low, and the gas can't flow freely indoors. Pay more attention when studying the position.