. and a good interior design idea is to look at the mirror in a living room. If the mirror is above the fireplace, ask why it is there. Is it for function or decoration or another reason or probably a mix of all three. In a living room, you may be unwittingly using the mirror as a central decorative object but you are not bringing out the full effect. This may be because of the mirror itself or general bad interior design planning for your room. In interior design, the purpose of the room is an important concept. The question of having a definite purpose for your room arises when you are looking at your room and its space. The mirror must have a specific purpose and this purpose can be brought out through the way the mirror or mirrors merges with the color tones in the room as well as the overall space and other furniture of the room.