A visualization method of time expressions using starting/ending point plane

The authors propose a method that visualizes the time transitions in written time expressions in order to analyze how the author used them. The method represents time expressions as points on a plane and connects them with lines. They apply the method to an adventure story and a company history and discover two characteristics. First, during the progression of the text, the durations implied by the time expressions change from long to short. Second, at the start of a new paragraph, expressions tend to refer to events or periods of longer duration.