In 2010, the artist Ai Weiwei covered the Tate Museum's Turbine Hall with porcelain replicas of what?

Ai Weiwei (born 28 August 1957) is a Chinese contemporary artist and activist. Ai grew up in the far north-west of China, where he lived under harsh conditions due to his father's exile. As an activist, he has been openly critical of the Chinese Government's stance on democracy and human rights. He investigated government corruption and cover-ups, in particular the Sichuan schools corruption scandal following the collapse of "tofu-dreg schools" in the 2008 Sichuan earthquake.

Opening in October 2010 at the Tate Museum in London, Ai displayed 100 million handmade and painted porcelain sunflower seeds. The work as installed was called "1-125,000,000" and subsequent installations have been titled "Sunflower Seeds". The initial installation had the seeds spread across the floor of the Turbine Hall in a thin 10 cm layer. The seeds weigh about 10 metric tonnes and were made by artisans over two and a half years by 1,600 Jingdezhen artisans in a city where porcelain had been made for Chinese rulers and court for over one thousand years.