Read the excerpt below from “The Lake of the Dismal Swamp” by Thomas Moore and answer the question that follows. “They made her a grave, too cold and dampFor a soul so warm and true;And she’s gone to the Lake of the Dismal Swamp,Where, all night long, by a fire-fly lamp,She paddles her white canoe. Which poetic device is illustrated by the line, “. . . all night long, by a fire-fly lamp”?