What does this wall represent to the speaker, and what does he do with that knowledge?

In the poem itself, Frost creates two distinct characters who have different ideas about what exactly makes a person a good neighbor. The narrator deplores his neighbor’s preoccupation with repairing the wall; he views it as old-fashioned and even archaic. After all, he quips, his apples are not going to invade the property of his neighbor’s pinecones. Moreover, within a land of such of such freedom and discovery, the narrator asks, are such borders necessary to maintain relationships between people? Despite the narrator’s skeptical view of the wall, the neighbor maintains his seemingly “old-fashioned” mentality, responding to each of the narrator’s disgruntled questions and rationalizations with nothing more than the adage: “Good fences make good neighbors.”As the narrator points out, the very act of mending the wall seems to be in opposition to nature.