Bill Nicholas identified several modes of documentary filmmaking that help categorize different documentary styles. The poetic mode uses artistic and lyrical techniques like continuous editing to provide subjective representations of reality. The expository mode relies on techniques like voiceover narration, interviews, and evidentiary editing to communicate factual information as seen in Taxi to the Dark Side. The participatory mode directly involves subjects through interviews or other interactions, while the observational mode observes events unfolding without interfering using techniques like no narration or music.