From The Tennessee Tribune:

Drive to the Gulf Coast for a holiday and by the time you get to the beach you will have crossed hundreds of invisible borders, most of them unnoted but nonetheless real.

Lines drawn on maps designate everything from state lines (each state gets two senators) to city council districts. Nashville has 35 of those. But it has 5 at Large council seats, too.

Maps can have overlapping lines for different things. Since the 1960s, congressional election districts all have had the same number of people living within their boundaries.

Read the full article here.