In a literary work, film or other narrative or story, the plot is the sequence of events, where each event affects the next one through the principle of cause-and-effect. The causal events of a plot can be thought of as a series of events linked by the connector "and so". Plots can vary from simple structures—such as in a traditional ballad—to complex interwoven structures sometimes referred to as subplot or imbroglio. In the narrative sense, the term highlights important points which have consequences within the story, according to Ansen Dibell.