“In its inaugural year, ArtPrize, which runs through Oct. 10, features 1,262 professional and amateur artists from 16 countries. They’ve been streaming into Grand Rapids for weeks, transforming 3 square miles of the center city into a playground of imagination. Winners of the $449,000 purse — including a $250,000 grand prize — will be selected by public vote rather than a jury of experts. Some artists are salivating over the cash. Others serve a more quixotic muse.”