A set designer contributes to the overall visual composition of a theatrical production primarily by incorporating architectural features. The set designer creates the physical environment where the action of the play takes place, which includes designing the scenery, props, and any architectural elements that help establish the mood, setting, and time period of the production. This visual foundation supports the actors' performances and enhances the audience's understanding and immersion in the story.
While costumes, sound effects, and script analysis are important aspects of a production, they are not the primary focus of a set designer's role in shaping the visual composition.