How does Saadat Hasan Manto use imagery in The Dog of Tithwal?

Manto uses images of darkness and light to demonstrate the difference between the men and the natural world around them. Darkness represents the men, blindness, and what is negative, and light represents nature, sight, and what is positive. During the night, the soldiers light huge fires in an attempt to ward off darkness. Yet they are able to overcome neither the darkness of night nor their own blindness. The biggest fires they can build can only illuminate a small patch of ground and do not enable them to see their enemies or to see within themselves. By contrast, Manto writes, "The morning broke . . . as if someone had switched on a light in a dark room. It spread across the hills and valleys." Nature is capable of producing an all-illuminating brightness that the men do not have.