In the Chinese Feng Shui Tradition Bagua Mirrors are used to protect homes from negative energies.
A Bagua Mirror has an Octagonal frame with a round mirror at its center. The coloring and decoration of the frame can vary, but many Bagua Mirrors are painted with the colors red, gold, and green, representing summer.
In Feng Shui, mirrors are used for protection and to ward off evil. It recognizes itself in them and takes flight, so that negative influences are dispelled. They also have an activating and expanding effect and can direct and balance the flow of energy. In the fairy tale the mirror stands for truth and knowledge.
Convex Mirror Shape: Energies bounce off them, they don't find a hold. Convex mirrors are always used where negative energies should be reflected. For example as protection against bad energies at front doors. For that it is recommended to use this mirror outdoors only!