Red geomantic omen should be used on the living room wall facing north. The five elements in the north belong to water, which is the place where water blooms, and water can make fire and money. Therefore, if you want to make the living room in the north prosperous, you should choose red, purple, pink and other warm colors. So these three colors should be the first choice for the wall, furniture and floor of the living room.
I hope it helps you.