Relying on the wall is due to local restrictions, which easily makes the wall wet and seeps off; Sofas are damp and corrupt, especially leather sofas and fabric sofas; The best place to allow is a U-shaped, beautiful, left, right, front and back channels, which are convenient for planting flowers on the back window platform, and flowers can also be placed behind the sofa without windowsill. From the perspective of geomantic omen, the back wall of the house is a backer, not a sofa attached to the wall.