In 'Brokeback Mountain' by Annie Proulx, the imagery of Jack observing Ennis creates a vivid contrast between light and darkness. Jack perceives Ennis as a small, warm flicker in an otherwise vast and intimidating landscape. This metaphor highlights the emotional significance of their connection amidst the overwhelming surroundings, emphasizing the warmth that love can provide against a backdrop of isolation.

This moment underlines the profound impact that their relationship has on Jack's life. Despite the harsh realities they face, Ennis represents a spark of hope and passion for Jack, suggesting that even a brief encounter can illuminate one's existence. The imagery reinforces the theme of yearning and the struggle for intimacy in a challenging world.