The imaginary fourth wall that is removed from box set to enable the audience to see the action on stage. The term now applies to the "wall" separating audience and performers on any type of stage or even film and television. Thus, the term "breaking the fourth wall" refers to an actor speaking directly to the audience.
An imaginary wall between the cast and audience which completes the area in which a piece is set.
The invisible, imagined, or implied wall through which the audience sees the performance.
the invisible wall open to the audience in a box set ( see also box set)
An imaginary wall between the actor s and the audience that disallows interaction between the two groups of people.
The invisible barrier between the audience and the actors. If the set of a given show is three walls of a room then the audience is "The Fourth Wall," and therefore ignored by the actors. When an actor addresses the audience directly - thereby acknowledging their presence - it is known as "Breaking the Fourth Wall."
In an interior setting of four wall, the side between the actor and the audience.
The fourth wall is the imaginary invisible wall at the front of the stage in a proscenium theater, through which the audience sees the action in the world of the play. The concept is generally presumed to have originated in nineteenth century theatre with the advent of theatrical realism.