Symbolism in theatre emerged as a reaction to Realism, focusing on inner lives and the subconscious. This movement used symbols, metaphors, and poetic language to explore abstract ideas and emotions, emphasizing atmosphere over plot. Maurice Maeterlinck, a key figure in Symbolist theatre, developed the concept of "static drama." His plays and essays, like The Treasure of the Humble, influenced modern drama by prioritizing subtext and the "unexpressed" in theatrical storytelling.