Concept:
The physical layout of a theatre dictates where actors stand, enter, and hide. Different eras of theatre history used different architectural solutions for these needs.
Step 1: Identifying the specific architectural feature.
In a Proscenium Theatre (or Proceniem), Wings are the areas offstage to the left and right that are hidden from the audience's view by curtains or flats. They are used by actors to wait for their cues and for storing scenery pieces that are about to be moved onto the stage. While Greek and Roman theatres had side entrances (parodoi or versurae), the specific term "Wings" is a hallmark of the proscenium arch stage that became dominant from the Renaissance onwards.