Here is the issue: we experience the world in scenes. We watch scenes on television, we see them in life from eye level, and we see them in our mind when we listen to the radio or read a book. We experience life watching a play on a proscenium stage. This view of life leads to a way of articulating concepts based on the mise-en-scéne of a narrative. Imagine this: the assignment is to design a poster for American Airlines and celebrate “spring in Paris.”
A standard solution might be to use a photograph of people sitting at café tables and the Eiffel Tower as a backdrop, or a happy couple strolling through Le marché aux Fleurs de l'Ile de la Cité (the flower and bird market). Many contemporary film posters adopt this articulation of an idea. The formula tends to follow the convention of three floating heads of the actors and a vignette of a scene below.