Each year, we look at the artists who have done some of the most impressive and influential projects over the last 12 months. From huge retrospective exhibitions to big-name collaborations with brands or others outside of the art world, there are a lot of ways artists can stand above the rest. Maybe an artist just tried a new medium, moving from sculpture and painting to filmmaking, or maybe he or she is an up-and-coming person on the scene who's already making big waves. From established art stars like Jeff Koons to young artists on the rise like Korakrit Arunanondchai, these are The Most Important Artists of 2014. Check out our list from 2013 to see how the art world has changed in just one year.