fifth wall

Bottom does not speak as a fictional figure pretending to be its actor, but, having crossed the fifth wall, as a “real” human being, as himself as Bottom.

If the 'fourth wall', the barrier between the actor and the audience introduced by theatre conventions, is an invisible artefact between the stage and the audience, the fifth wall may be thought of as the invisible wall between critics or readers and theatre practitioners.

There's a fifth wall here tonight. And that's the wall between men and women. Which may be the toughest of all to crack.

The fifth wall is the ceiling. Ceilings can be painted a color, painted with special effects, or wallpapered.

There's a "fifth wall" in every room. ..and it needs more care than the other four, put together. That "fifth wall" is the floor.

Most rooms that I know of have four walls. If you are looking for a way out and you wind up on the fifth wall of what seems like a square room, chances are you missed an opening.