Ai Weiwei takes over Alcatraz with Lego carpets and a hippie dragon

The big man of Beijing’s new show fills the former prison with a giant rainbow dragon and Lego models of 175 prisoners of conscience, from Nelson Mandela to Edward Snowden. The artist’s bravery and commitment are extraordinary. Subscribe to The Guardian ► Get the whole picture ► GUARDIAN PLAYLISTS Guardian Investigations ► Comment is Free ► Guardian Docs ►