What does nick see in the yard after he returns from the buchanans?

After returning from the Buchanans' house, Nick sees Gatsby standing alone in his yard, gazing across the bay at the green light on Daisy's dock. This moment highlights Gatsby's longing and obsession for Daisy, symbolized by the green light. The scene underscores the theme of unfulfilled dreams and the distance between Gatsby's aspirations and reality. Nick's observation emphasizes his growing awareness of Gatsby's emotional struggles and the complexity of the American Dream.