A revolution is taking place in the art world and it isn’t happening in Paris, Berlin or Hong Kong—but in Grand Rapids, Michigan. ArtPrize is the most highly attended art show in the world, and it awards cash prizes larger than all other competitions combined. International critics and general crowds pack bars, galleries and abandoned buildings all over town, taking in over 1,500 works from cerebral conceptualists and weekend hobbyists. An acclaimed jury awards a winner $200,000 and the ballot-c...