4. Ai Weiwei goes big

One year ago this time, Ai Weiwei paved the Turbine Hall of London's Tate Museum with 100 million handcrafted porcelain sunflower seeds. Porcelain is nearly synonymous with China, and the exhibit invited people to take a closer look at the 'Made in China' phenomenon. "From a very young age, I started to sense that an individual has to set an example in society," he has said. "Your own acts and behavior tell the world who you are and at the same time what kind of society you think it should be."