There are several possible synonyms for the phrase "all the world's a stage," which could be useful in conveying the idea of the world as a performance or a dramatic spectacle. Some possible options might include phrases like "life is a drama," "the world is a theater," or "existence is a play." Each of these phrases captures the notion that our lives are like performances, in which we play various roles and interact with one another in complex and sometimes unpredictable ways. Whether through tragedy or comedy, the human experience can be seen as a grand theatrical production, with all of us playing our parts on the world's stage.