I always thought the Mason-Dixon line was an aid?

In any regard I think this is a pretty cool reckoning back to a different time:



"A "crownstone" boundary monument on the Mason-Dixon Line. These markers were originally placed at every 5th mile along the line, oriented with family coats of arms facing the state that they represented. The coat of arms of Maryland's founding Calvert family is shown. On the other side are the arms of William Penn." -Wikipedia