Understanding the use of imagery in poetry is essential for a comprehension of the overall meaning.
Images are essentially word-pictures and they usually work by a method of association.
This means that the images are created by associations that we make as readers within the linguistic context of the text. This color is associated or has connotations with other feelings or images, like anger, and this increases the depth of the poem. The important thing to remember is that the images are an instrument that the poet uses to express his or her intentions or feelings. Understanding the use of images means understanding the essential meaning of the poem. The central theme of the poem is about the feeling of despair at the decline and decadence of modern civilization.