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How did Denis Diderot’s idea of the fourth wall change theatrical realism?

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Dimitry Levitzky: portrait of Denis Diderot — Denis Diderot Portrait of Denis Diderot, oil on canvas by Dimitry Levitzky, 18th century.

Denis Diderot transformed theatrical realism by introducing the concept of the fourth wall, an imaginary barrier separating the actors from the audience.12

Diderot argued that for a performance to achieve greater realism, actors should behave as if the curtain had never risen and the audience were not present. By ignoring the viewers, performers would not be tempted to address them directly, allowing the audience to become voyeurs observing the narrative rather than participants in the artifice. This approach encouraged actors to focus on their characters' specific professions and social milieus, thereby heightening the impact of the play's moral and social implications.12

Ultimately, this convention became a cornerstone of 19th-century Naturalism, shifting the focus of drama toward a more immersive, realistic portrayal of private life.13