The Grand Union was a leaderless improvisation group in SoHo in the 1970s that included people who became some of the biggest names in postmodern dance: Yvonne Rainer, Trisha Brown, Steve Paxton, Barbara Dilley, David Gordon, and Douglas Dunn. Together they unleashed a range of improvised forms from peaceful movement explorations to wildly imaginative collective fantasies. This book delves into the « collective genius » of Grand Union and explores their process of deep play. Drawing on hours of archival videotapes, Wendy Perron seeks to understand the ebb and flow of the performances.