The British art superstar Flora Yukhnovich, the Freakonomist Steve Levitt, and the upstart American Basketball Association were all unafraid to follow their joy — despite sneers from the Establishment. Should we all be more willing to embrace the déclassé? And: nearly 2 percent of America is grassy green. Sure, lawns are beautiful and useful and they smell great. But are the costs — financial, environmental and otherwise — worth the benefits?