What is dumb decoration?

Usually refers to the mouth of the living room balcony: the separation between the living room balcony and the living room, usually there will be two battlements on both sides of the wall, with beams on them, which will form a big shape similar to the doorway, which we call dumb mouth;

There are often between the living room and the dining room; Between the kitchen and the cold balcony; In short, it is something like a doorway, with battlements on both sides and beams on it, which is called dumb mouth.

Sometimes in order to distinguish areas, or to look beautiful, we will deliberately make this shape to separate areas.