Bill Nichols identified six modes of documentary: poetic, expository, observational, participatory, reflexive, and performative. Each mode has distinct characteristics. The poetic mode uses abstract expression and emotion with no clear beginning, middle, or end. The expository mode directs the audience through narration and voiceovers. The observational mode observes events as they occur with no commentary. The participatory mode involves the filmmaker interacting directly with subjects. The reflexive mode acknowledges the filmmaking process. And the performative mode addresses the audience directly and acknowledges different perspectives.