What refers to the strategy for positioning set pieces to enhance the audience's experience?

The strategy for positioning set pieces to enhance the audience's experience is referred to as sight lines. This concept focuses on how the arrangement and placement of elements in a performance space can significantly affect how the audience perceives the action on stage. By considering sight lines, a director or designer ensures that all audience members have a clear view of the important aspects of the performance, which can include the actors' movements, facial expressions, and critical set pieces.

Good sight lines optimize the visibility of the performance, enhancing the overall experience and engagement of the audience. This thoughtful arrangement contributes to the production's effectiveness, allowing for a more immersive and impactful theatrical experience.

The other options relate to different aspects of stage design: a ground plan is a technical drawing that illustrates the layout of the stage and its elements; a key is typically a reference guide for understanding symbols used in set designs; and set dressing refers to the additional decorations and props used to create the atmosphere of a scene. While these elements are important, they do not specifically address the strategic positioning discussed in relation to enhancing audience experience.