The opera uses a variety of musical techniques to create unity and coherence. The first is leitmotifs. As with most examples of this method, each leitmotif is used in a much subtler manner than being directly attached to a character or object. Still, motifs for the Captain, the Doctor and the Drum Major are very prominent. Wozzeck is clearly associated with two motifs, one often heard as he rushes on or off stage, the other more languidly expressing his misery and helplessness in the face of the pressures he experiences. Marie is accompanied by motifs that express her sensuality, as when she accepts a pair of earrings from the Drum Major. A motif not linked to a physical object is the pair of chords that close each act, used in an oscillating repetition until they almost blur into one another.