The word 日落 is formed by combining the character 日, which pictorially represents the sun, with the character 落, which depicts the action of something falling or descending, as suggested by its grass radical (艹) implying plants falling and its phonetic component. Together, they create a direct visual and conceptual composite: the sun (日) in the process of setting or falling (落), thereby encapsulating the natural event of sunset through this simple, descriptive pairing of elements.