We use lines and maps to our advantage. And sometimes to our detriment. Sometimes we use them to make sure people we don't like stay 'out' or don't get to 'have' what we feel entitled to have, like the right to drill for oil on native lands, or the right to have thousands of acres to herd cattle. Or the right to have access to wild space, or the right to live on the side of the city with more real estate value.