From 2003 to 2005, Zhang has portrayed 100 immigrant workers in life-size resin sculptures of various postures, with a designated number, the artist's signature and the work's title "Chinese Offspring" tattooed onto each of their bodies. They are often hung upside down, indicating the uncertainty of their life and their powerlessness in changing their own fates.
Zhang Dali went on to make portraits of migrant workers' faces and resin casts of their heads or entire bodies. Having a studio on the outskirts of Beijing, Zhang Dali became acquainted with a community of migrant workers who lives nearby.
Migrant workers have emerged as a product of the urbanization and growth of the main Chinese cities. Mobility has come with reform and this is not always an easy choice. The cities have developed into places of wealth and opportunity, thus drawing all sorts of people in search of better lives. However with this growth of the cities and the introduction of so much from the West: architecture, food, fashion, social manners, etc. has come also great uncertainty. For the migrant worker uncertainty is one of the key elements of their existence. Zhang Dali wanted to bring these people and their hard, bitter lives to the attention of others, and did so by creating head and body casts of volunteers from among these people as well as painting their portraits in his AK-47 series.The presentation of the body casts is vital to transmitting the artist's message. They are shown hanging upside down from ropes tied around their ankles.