What function does back light serve in filmmaking?

Back light plays a crucial role in filmmaking by illuminating the subject from behind, which helps create a three-dimensional effect. This lighting technique adds depth to the scene by highlighting the edges of the subject, thus separating it from the background. It enhances the visual perception of depth, making the subject stand out more prominently against the setting.

By using back light, filmmakers can define the shape of the subject, adding to its visual appeal and ensuring it doesn’t appear flat. This technique is important for creating mood and atmosphere, and it can contribute significantly to the overall aesthetic of a shot.