Stage is all that space for the representation of the various performing arts or it is used for public events i.e. conferences, meetings, etc. Throughout the history, the stage space has evolved from its use in the classical world to new vanguard proposals, systematized in the early years of the twentieth century by Europeans playwrights.
There are four basic types of stages that vary in use and in relation to the public. The most common form in the West is the setting of proscenium type, where the public stands on one side of the stage. A variant is the stage with a platform or interpretation area that extends into the audience so that it surrounds the stage on three sides. In the stage of circular type such as the circus, the public is around the show. A fourth type of stage is one that is built specifically for a representation or involving a pre-existing space and adapted as a stage; in an extreme example, as a stop or parade aviation investigators theater as a semiotic and structural phenomenon venture on stage.
Taking the stage as a space delimited by three planes or walls containing and embrace staging is called fourth wall the invisible space that insulates the public stage. The expression breaking the proscenium or breaking the fourth wall is used when the actor speaks directly to the audience saving the distance and making more participatory and warm show. It was widely used in the epic theater of Konstantin Stanislavsky and Bertolt Brecht and is considered one of the key change in the theatrical approach from the twentieth century.
In the origins of the theatrical phenomenon, possibly religious or magical content, the stage was chosen to make any representation and strength of the ritual or ceremonies which had just been giving special significance. The first stages of ancient Greece possessed marquees or tents located behind the orchestra that served the actors to change their masks or other items of props; they later developed into amphitheaters outdoors with permanent stages. The same type of building was adopted by the Romans that spread throughout Europe.
During the Middle Ages, they were used to interpret mysteries and miracles in the cathedrals and porches on small portable stages. Already in the XVI century, they appeared in southern Europe comedy theaters, bringing a new urban concept of the theatrical stage. The next evolutionary step in the history of classical stage space would be the traditional theater, a specific building for dramatic performances.