What distinguishes a proscenium stage from other stage layouts?

A proscenium stage is distinguished by its traditional design, characterized by the proscenium arch that frames the stage, separating the audience from the performance area. This traditional layout creates a clear distinction between the performers and the audience, which enhances focus on the action that is taking place on stage. The design is widely recognized and has been used in many historical theatrical productions, making it synonymous with conventional theater.

While audience interaction is more typical in other stage configurations like thrust or arena stages, the proscenium stage's definitive framing often limits such interaction. Although fixed backdrops can be used, they are not a unique feature as many stages can incorporate them. The design is not exclusive to large productions; many small to medium-sized performances also utilize the proscenium stage due to its versatility and familiarity. Thus, the defining characteristic of the proscenium stage is indeed its status as the most traditional stage layout.