Final answer:
The apron of a proscenium stage is the part of the stage in front of the proscenium arch that extends towards the audience, often covering the orchestra pit when not in use. It serves as additional performance space and can help actors engage more directly with the audience.
Step-by-step explanation:
The apron of a proscenium stage is the part of the stage that extends out towards the audience from the proscenium arch. This area can sometimes cover what would otherwise be the orchestra pit during performances that do not require live musical accompaniment. In a traditional proscenium theatre, this acts as an additional performance space, giving actors more room to move closer to the audience. The integration of the apron into the performance can break the strict separation between the actors and the spectators, blurring the conventional boundaries of the iconic "fourth wall".
Proscenium theatres, known for their framed stage by the proscenium arch, typically are designed with various technical spaces such as the wings and the fly loft. The apron provides an extra vantage point for the audience, enhancing visibility, which is often complemented by a raked audience area. It's worth noting that established venues like Teatro La Fenice in Venice are examples of proscenium theatres where the design and use of the apron might be representative.