In 'As froth on the face of the deep', the quote "As gourd of a day and a night, As harvest that no man shall reap", the use of Juxtaposition of day and night highlights the contradiction between light and dark, representing the contrast between hope and despair, or fulfilment and emptiness - Day and night are cyclical opposites, yet they coexist in the passage of time - In this metaphor, they serve to emphasize the ephemeral nature of life - how fleeting moments, like the gourd’s growth, appear and disappear quickly, showing that human experiences can be both transient and inescapable, regardless of whether they occur in the light or the dark