The formation of the Clerical Script is an important turning point in the evolution of Chinese characters because it lays a foundation for the squatter shape of the later script forms. Seal Script appeared in the Warring States Period. And it was formed in Qin Dynasty. Then, it became dominant in the Han dynasty and remained in use through the Wèi-Jìn periods. The Simplified Chinese, developed by the People's Republic of China in 1954 to promote mass literacy, is a standardized characterset used in mainland China.