For the speaker of "Mending Wall" by Robert Frost, what does the wall symbolize?

The wall in "Mending Wall" by Robert Frost symbolizes the barriers we set up upon people.

Explanation:

The wall is presented in different lines in this poem as the element that connects the two neighbors at the same time that it separates them. We can see metaphors related to the wall in lines 13, 14, 16, 21, 27 and 35. The poem shows how very different personalities and lives are drawn over the walls that we set around.

The central symbolism of Robert Frost's poem, "Mending Wall," is people's tendency to set up barriers, essentially to isolate themselves, despite the futility of doing so. On the surface, the poem tells the story of a farmer and his neighbor mending a wall that divides their property.