Zhang is currently based in Shanghai. His work is in numerous prestigious collections including the Rubell Family Collection (Miami). His work often features themes related to dislocation and change. Zhang often uses ordinary, neglected, everyday objects in his work. This piece is oil on canvas.
Sun, who lives and works in Beijing, usually works in animation and drawiing. If you look at the closeup of his piece below you will see it is created over top of paper clippings from an old Xinhua Dictionary. If you go to the gallery site linked above you can seem more of his expressive work.