What is the main conflict in Variations on Nothing by Giuseppe Ungaretti?

The single dominant theme in "Variations on Nothing" is the endurance of inanimate things over human life. The title itself seems to mock humans in touting the variety of nothingness that exists in the world—an existence that outlasts even earth's highest forms. To make the point clear, Ungaretti offers five distinct examples to support the poem's central idea, and the concrete images serve to make the main point easier to visualize.