Hieroglyphs are mainly written in the image of "things". With the gradual expansion of human social activities and frequent economic and military activities, this kind of pictures and words can no longer fully express what human beings want to express. At this time, a new type of picture writing that can express complex concepts and meanings came into being-cuneiform writing. When the graphic symbols are simplified enough to form a specific correspondence with the language, the original text is formed. In Introduction to Ancient Philology, Tang Lan divided ancient Chinese characters into four systems. Yin Shang, Western Zhou Dynasty, Six Kingdoms, Qin Dynasty.
From Oracle Bone Inscriptions to Xiao Zhuan, Chinese characters changed from the way of describing images in details to the direction of simplifying descriptions, and the form gradually separated from the concrete images of things. Chinese characters in this period are also called ancient Chinese characters. Writing is actually a medium, and people communicate through conventional visible symbols. It is the character symbol system of people's recording language. The history of human writing runs through the whole history of visual connection from early pictures to words.
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