Key image dramas are often used to create a sense of mystery and intrigue, as they can be used to hint at what will happen in the story without giving away too much detail. They can also be used to create a sense of atmosphere and mood, as they can convey a certain feeling or emotion to the viewer.
Some famous examples of key image dramas include the BBC series Sherlock, which uses key images such as the deerstalker hat and the magnifying glass to represent the main character, Sherlock Holmes; and the American series Breaking Bad, which uses key images such as the RV and the hazmat suit to represent the main character, Walter White.