Shenzhen has been an important experiment for the Chinese since 1980 when it was designated a "Special Economic Zone". It was created to be an experimental place for the practice of market capitalism within a community guided by the ideals of "socialism with Chinese characteristics"
Shenzhen is the gateway between mainland China and Hongkong. The Chinese government hoped Shenzhen would become the "silicon valley" of China, it has and it seems to have surpassed the American silicon valley.
Here is a Bloomberg video that highlights some of the more dystopian aspects of Shenzhens development. I must say it looks shiny and clean.
Video dated Jan 24, 2019