Ai Weiwei opens London installation `` Sunflower Seeds '' Ai Weiwei says he had planned a visit to ` ` observe '' a government plan to expand his studio . Ai says he was not allowed to leave his house . His house is guarded by police , he says .
Ai Weiwei says he had planned a visit to ` ` observe '' a government plan to expand his studio . Ai says he was not allowed to leave his house . His house is guarded by police , he says .