What metaphors are used in Islands in the Stream by Ernest Hemingway?

Another common Hemingway technique is the use of simple objects as important symbols and metaphors. For example, driftwood means more than something that interests Thomas Hudson. Thomas admires driftwood as natural art, yet he burns the wood and appreciates how it burns. The implication follows that Thomas finds the destruction of beauty as also being beautiful, perhaps representing a sacrificial urge to kill that which one loves. The swordfish that David comes to love is another metaphor for this deep human desire. Whether he lands the trophy or not, the destiny of the swordfish is death.