"Danielle Goldman's contribution to the theory and history of improvisation in dance is rich, beautiful and extraordinary. In her careful, rigorously imaginative analysis of the discipline of choreography in real time, Goldman both compels and allows us to become initiates in the mysteries of flight and preparation. She studies the massive volitional resources that one unleashes in giving oneself over to being unleashed. It is customary to say of such a text that it is 'long-awaited' or 'much anticipated'; because of Goldman's work we now know something about the potenza, the...