Ai Weiwei

Bicycles are seen as part of the installation entitled "Libero" (Freedom) by the Chinese artist Ai Weiwei at the Palazzo Strozzi in Florence, Italy

Alessandro Bianchi/Reuters

Bicycles are seen as part of the installation entitled “Libero” (Freedom) by the Chinese artist Ai Weiwei at the Palazzo Strozzi in Florence, Italy

Chinese artist Ai Weiwei poses for photographers with one of his pieces at his exhibition at the Royal Academy of Arts in London, Tuesday, Sept. 15, 2015. The exhibition opens to the public on September 19th

Frank Augstein/AP

Chinese artist Ai Weiwei poses with one of his pieces at his exhibition at the Royal Academy of Arts in London, Tuesday. The exhibition opens to the public on September 19th

Visitors looks at the installation called " Bang " by China's artist Ai Weiwei at the German pavilion during the 55th La Biennale of Venice

Stefano Rellandini/Reuters

Visitors looks at the installation called ‘Bang’ by Chinese artist Ai Weiwei at the German pavilion during the 55th La Biennale of Venice

Hong Kong Ai Weiwei

Kin Cheung/AP

Point of discussion: staff chat in front of the latest sculpture installation from Ai Weiwei, the Chinese dissident artist. His “Baby Formula” forms a map of China with cans of milk powder at an exhibition in Hong Kong. Mr Ai’s work was inspired by the scandal over melamine-tainted milk powder in China in 2008, which was reported to have affected nearly 300,000 children and caused six babies to die from kidney problems