+The **fourth wall** is an invisible, imagined barrier separating a performance from its [Audience](/wiki/audience). It forms an unspoken agreement, maintaining the illusion of a self-contained [Reality](/wiki/reality). When this boundary is breached, characters may directly acknowledge the observer's presence.
+## See also
+- [Metatheatre](/wiki/metatheatre)
+- [Immersion](/wiki/immersion)
+- [Direct Address](/wiki/direct_address)
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