Generally all houses, flats or apartments have a central wall that divides the living room, kitchen,from the bedrooms, study, etc. Can we say that since such wallsare not the perimeter walls of a house or apartment, they are not facing any of the important directions of NESW, or NE, SE, SW or NW etc and hence they are not the facing walls where the Grand Duke, Five Yellow, Three Killings are, so wecan afford to be less wary of and can do renovations, hang things or drive nails into such walls?