This is one of the masterpieces introduced in Tate Modern’s vast Turbine Hall (London) by Chinese artist Ai Weiwei. At first glance, these are usual sunflower seeds. But if you take a closer look, you’ll see huge seeds that are not real. These are hand-painted replicas made out of porcelain. Each seed is unique, and there are one hundred million of them. Can you believe that it took 2.5 years and 1,600 people to produce this installation?