In the acclaimed Blood Rites , Barbara Ehrenreich delved into the origins of our species' attraction to war. Here, she explores the opposite impulse, one that has been so effectively suppressed that we lack even a term for the desire for collective joy, historically expressed in ecstatic revels of feasting, costuming, and dancing. Ehrenreich uncovers the origins of communal celebration in human biology and culture. Although sixteenth-century Europeans viewed mass festivities as foreign and "savage," Ehrenreich shows that they were indigenous to the West, from the ancient Greeks' worship of Dionysus to the medieval practice of Christianity as a "danced religion." Ultimately, church officials drove the festivities into the streets, the prelude to widespread Protestants criminalized carnival, Wahhabist Muslims battled ecstatic Sufism, European colonizers wiped out native dance rites. The elites' fear that such gatherings would undermine social hierarchies was the festive tradition inspired French ...