Matthew Akers’s documentary follows the Serbian-born performance artist as she prepares for a major retrospective at New York’s MOMA. For the last 40 years, Abramović has been fearlessly using her body to explore both her own limits and the nature of art. In the notoriously dangerous Rhythm 0, audience members could do what they wanted to her body using instruments such as saws, nails and a loaded gun. It echoed Yoko Ono’s Cut Piece (1964), in which Ono invited audience members to cut out a piece of her clothing on stage.