In storm on an island, Heany presents the poem as a constant battlefield between man and nature. The way he does this is by using the language of metaphor and Oxymoron. “Space is salvo” From this quote, we understand that salvo is relating to a shootout between nature and man. The line of explaining space which intends to be empty as salvo links to how the gunfire is invisible just like the the actual storm in the poem.