When we talk about "exploration" here, we don’t necessarily mean Christopher Columbus or Amerigo Vespucci. Our speaker explores uncharted waters as he begins to question why there needs to be a wall between his property and his neighbor’s property. Our speaker challenges the old-school values that his neighbor embodies.
In challenging the wall’s necessity, the speaker ultimately does not hope to get rid of the wall.
As readers, we discover more about our relationship to boundaries than the speaker does.