Writing
The invention of the first writing systems is roughly contemporary with the beginning of the Bronze Age of the late 4th millennium BC. The Sumerian archaic cuneiform script and the Egyptian hieroglyphs are generally considered the earliest writing systems, both emerging out of their ancestral proto-literate symbol systems from 3400 to 3200 BC with earliest coherent texts from about 2600 BC. It is generally agreed that Sumerian writing was an independent invention; however, it is debated whether Egyptian writing was developed completely independently of Sumerian, or was a case of cultural diffusion.
Chinese bronze inscriptions
For the early Western Zhou to early Warring States period, the bulk of writing which has been unearthed has been in the form of bronze inscriptions. As a result, it is common to refer to the variety of scripts of this period as "bronze script", even though there is no single such script. The term usually includes bronze inscriptions of the preceding Shang dynasty as well.
However, there are great differences between the highly pictorial Shang emblem (aka "identificational") characters on bronzes (see "ox" clan insignia above), typical Shang bronze graphs, writing on bronzes from the middle of the Zhou dynasty, and that on late Zhou to Qin, Han and subsequent period bronzes. Furthermore, starting in the Spring and Autumn period, the writing in each region gradually evolved in different directions, such that the script styles in the Warring States of Chu, Qin and the eastern regions, for instance, were strikingly divergent. In addition, artistic scripts also emerged in the late Spring and Autumn to early Warring States, such as Bird Script (鳥書 "niǎoshū"), also called Bird Seal Script ("niǎozhuàn" 鳥篆 ), and Worm Script ("chóngshū" 蟲書).