Finding a Metaphor

Hey! Can y'all help me find a metaphor in this poem. Its "Jamie" by Elizabeth Brewster

(1)When Jamie was sixteen Suddenly he was deaf. There were no songs, No voices any more. He walked about stunned by the terrible silence. (5)Kicking a stick, rapping his knuckles on doors, He felt a spell of silence all about him, So loud it made a ringing in his ear. People moved mouths without a second escaping: He shuddered at the straining of their throats. (10)And suddenly he watched them with suspicion. Wondering if they were talking of his faults, Were pitying him or seeing him with scorn. He dived into their eyes and dragged up sneers, And sauntering the streets imagined laughter behind him. (15)Working at odd jobs, ploughing, picking potatoes, Chopping trees in the lumber woods in winter, He became accustomed to an aimless and lonely labor. He was solitary and unloquacious as a stone. And silence grew over him like moss on an old stump. (20)But sometimes, going to town,
He was sore with the hunger for company among the people And, getting drunk, would snout at them for friendship, Laughing aloud in the streets. He returned to the woods, (25)And dreaming at night of a shining cowboy heaven Where guys crashed through his deafness, awoke morose, And chopped the necks of pine trees in his anger.