Borders are imaginary. Where they are not demarcated by mountain ridges or rivers, they are but a mysterious statutory boundary, invisibly imposed on the landscape. We can choose to acknowledge them or not in manifold ways.
Though law and custom may dictate their importance, and though they must be adhered to in many things, they also hold us back. These lines alter our perception of proximity and cause unnecessary friction with our very real neighbors. When we put county lines, state lines out of mind we build greater cohesion and stronger societies.