Feng Shui: The first hammer of decoration should be knocked at the corner to be demolished, which symbolizes the meaning of final decision and is also an expression of breaking ground for new houses.
If there is no wall to be demolished, you can knock on the first corner of the wall clockwise at the entrance, indicating smooth sailing. Of course, different people knock on the door in different ways, and some people knock on the kitchen first.
Reality: the decoration company is doing well, and the owner must pay, and both parties have the final say.