Ai Weiwei webchat – post your questions now

The controversial Chinese artist is joining us to answer your questions in live webchat from noon BST onwards on Friday 11 September – post yours in the comments below 9.58am BSTFrom his vast sea of sunflower seeds in Tate Modern, to his vision for the Bird’s Nest stadium in Beijing, Ai Weiwei’s art is arresting in its scale, moving in its humanity, witty in its iconoclasm – and strident in its politics.His art and campaigns – including the naming of students killed