Ai Weiwei's commission for The Unilever Series at the Tate Modern has just been unveiled. Sunflower Seeds is made up of millions of life-sized sunflower seed husks, which are actually intricately hand-crafted porcelain. Each seed has been individually sculpted and painted by specialists working in small-scale workshops in the Chinese city of Jingdezhen. The 100 million seeds have been poured inside the Turbine Hall’s vast industrial space, and visitors can walk over them and touch them, an invitation to look at the ‘Made in China’ phenomenon. This is the largest porcelain work Ai has ever made.