The rainbow is the only image in this poem,but it plays a very important role in this poem. It may be simply the natural phenomenon,the sheer and breath-taking beauty of the handiwork of God. It may also be a symbol of the natural beauty,the virtues of piety,or peace.The rainbow is the only image in this poem, but it plays a very important role in this poem. It may be simply the natural phenomenon, the sheer and breath-taking beauty of the handiwork of God. It may also be a symbol of the natural beauty, the virtues of piety, or peace