Visitors stopped from Beijing on carpet of seeds . But with the seeds , too much dust , at Tate Park . Ai famous for co - founding Beijing 's ` ` Bird 's Nest '' stadium . Also well - known blogger and outspoken critic of Chinese government .
Visitors stopped from walking on carpet of seeds . Interaction with porcelain seeds generating too much dust , says Tate Modern . Ai famous for co-designing Beijing 's `` Bird 's Nest '' stadium . Also well-known blogger and outspoken critic of Chinese government .