Moulding, mixing and pouring must form fair-faced concrete with high-level technology at one time, which presents the aesthetic realm of sincerity, sincerity and nature. No matter how experienced and sophisticated the master is, he can’t accurately “calculate” the quality effect of each time before demoulding. The gray tone of fair-faced concrete is the most authentic expression of concrete material, and it is the spirit of Farr and the natural realm of Taoism.