What are the techniques of calligraphy in the middle of the Western Zhou Dynasty?

By the middle of the Western Zhou Dynasty, the works of Mu, Gong Wang and others, such as "The Name of a Lady in Lu" and "The Name of a Lady", were all composed of such purified lines. The purification of lines has completed an important refining calendar in calligraphy techniques; In essence, he completed the introspection from the changeable external form to the internal rhythm; In the form of expression, it has completed the transformation from carved description to smooth writing. This kind of writing is not straightforward, but requires a high degree of technical specification, not rigid, but fluent.