The Shape of SpiritualityAround 20 percent of Americans fall into the category of "spiritual but not religious." Yoga has become a ubiquitous pastime for middle class Westerners. Mindfulness is increasingly incorporated into school curricula, sports programs, and even corporate culture. Hollywood icons and Silicon Valley trendsetters tout the benefits of a "spiritual" life. These developments reflect a widespread turn away from "religion" toward "spirituality." Yet the nature