Why do residents hang a small round mirror on the window? Is there any feng shui?

In fact, the main function of hanging mirrors on doors and windows is to stop the suffocation. As we all know, the mirror can reflect light. Generally, it blocks the doors and windows that come straight from the opposite side, such as rivers, sharp corners, sharp stones, roads, trees, telephone poles, viaducts and blade walls. From the professional perspective of geomantic omen, these are really unfavorable to the family's various fortunes, such as family health and wealth. It really needs to be hung in the mirror. And it is best to hang a professional mirror, such as a professional gossip mirror and a convex mirror.