Ai Weiwei is China's best-known artist,blogger and critic of the government. The Haus der Kunst in Munich is now hosting his largest solo exhibition to date. Ai Weiwei enjoyed long years of freedom,but ever since he investigated the victims of the Szechuan earthquake,he's come under pressure in China. Nonetheless,Ai Weiwei won't let himself be intimidated. ARTS.21 presents a portrait of the artist.