Trained as a painter, O. was cofounder of the Hamburger Filmschau, alongside with her husband and collaborator Werner Nekes. For all the psychedelia of her early work, subsequent films are rigorous in refractory experimentation: rear-projections, double-impositions, repeated frames and breathtaking lunges of the handheld camera, which seems bolstered as much by raw impulse as it does by any guidin...