Camera work is important in film openings to set mood through angles, movements, and focus that emphasize aspects of the scene. Low angles make characters seem strong while high angles make them seem weak. Genres are defined by their narrative elements and use of techniques like camerawork, lighting, sound, and editing that are distinctive for each type of story. Narration determines the point of view that the story is told from, either verbally or through character actions. Lighting, sound, editing, and casting are also codes and conventions that filmmakers use to communicate specific ideas or meanings to viewers.