Lan Zhan thinks carefully, his face that perfect apparent blankness that will follow him to adulthood. "Wood governs the liver and the gallbladder," he says, finally. "It is associated with the sour taste, the Azure Dragon, and the season of spring. Metal governs the lungs, the large intestine, and the skin. It is associated with the pungent taste, the White Tiger, and the season of autumn."