Existentialism is a concept that became popular during the second World War in France, and just after it. French playwrights have often used the stage to express their views, and these views came to surface even during a Nazi occupation. Bernard Shaw got his play "Saint Joan" past the German censors because it appeared to be very Anti-British. French audiences however immediately understood the real meaning of the play, and
replaced the British with the Germans. Those sorts of "hidden meanings" were common throughout the period so that plays would be able to pass censorship.
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