Why do most shots in a film rely on both on sceen and off screen spaces?

Most shots in a film rely on both on-screen and off-screen spaces to create a richer narrative and enhance viewer engagement. On-screen space focuses the audience's attention on visible elements, while off-screen space invites imagination and speculation, suggesting the existence of unseen characters or events. This interplay helps build tension, develop themes, and immerse viewers in the story world, making the experience more dynamic and layered. By utilizing both spaces, filmmakers can convey deeper meanings and emotional resonance.