These "logos" were developed in China 2,000 years ago. They may record the time and location of the creation as well as artisans, and may also very well be among the world's earliest trade marks.
Video: Center for Language Education and Cooperation, Chinese Ministry of Education
Intangible Cultural Heritage
Foreign vloggers experience Jin Opera in Shanxi
Intangible Cultural Heritage
Fire Dragon Dance brings fiery night spectacle to Datong, Shanxi