Fifty-four-year-old artist Ai Weiwei is both an art-world celebrity and an outspoken critic of China's record on human rights. After 2008's Sichuan earthquake, he worked tirelessly to identify those killed in the quakes, with particular emphasis on the schoolchildren who died in shoddily constructed schoolhouses. The Chinese government responded to such criticism by shutting down his blog (he's extremely active on social media), subjecting him to constant surveillance, and, in 2011, briefly imprisoning him. First-time filmmaker Alison Klayman gets all of the above on film in her remarkably absorbing and affectionate documentary. by Alison Hallett