What do calligraphy rules pay attention to in order to achieve the harmony and unity of part and whole?

Calligraphy also pays attention to connecting the preceding with the following, looking around and changing irregularly. Appropriate density, reasonable inscription and seal, pay attention to the harmony and unity of local beauty and overall beauty. Bao Qing Chen Shi said: "The font size of ancient posts is quite different. For example, the elderly bring grandchildren, and the length is uneven, but the affection is sincere and painful." It vividly illustrates the artistic effect of the overall beauty of calligraphy works.