Ai Weiwei
The Free Ai Weiwei street art campaign was a series of protests during the PRC government's secret detention of Chinese artist Ai Weiwei for 81 days in 2011, organised by Hong Kong artists and art supporters. Various slogans calling for the immediate release of the artist such as "Free Ai Weiwei", and "Who's afraid of Ai Weiwei" accompany stencilled images of Ai were applied onto pavements, pedestrian overpass, and building walls all over Hong Kong, and similar posters and signs were displayed worldwide.