3,500 B.C.

c3500 BCE   Earliest known examples of writing which will evolve into a tool of Gnostics later on.
35th century BCE: Appearance of Pit-Comb Ware culture, beginning of the Middle Jeulmun pottery period
It also allowed for a much greater population density, and in turn required an extensive labor force and division of labor. This organization led to the development of writing (ca. 3500 BC).
In the course of the 3rd millennium BC the script became successively more cursive, and the pictographs developed into conventionalized linear drawings, the number of characters in use also refined from around 1,000 unique characters in the Early Bronze Age to around 400 characters in Late Bronze Age (Hittite cuneiform).