The official dividing line between Chicago's north and south sides is Madison Street as it marks a major spot in the city's street numbering system.
As for the unofficial dividing line between the Chicago Cubs and Chicago White Sox fanbases? Well, it might as well be this residence at 713 West 19th Street, which was spotted on Google Maps and then placed on Reddit's r/chicago board.
Though the house is located south of Madison, it's as good a place as any to draw a line in the sand. There are plenty of Sox fans living in Cubs territory and vice versa, so it's as close as you're going to get in providing a line of demarcation for nosy satellites and airplane pilots.
And while it's true in the sense that most Cubs fans are located to the north of that residence and Sox fans to the south, some might also say the rooftop writing could also be interpreted as some astute commentary on the respective conditions of each team's farm system.
Either way, we'll mark this down as the second greatest Google Map moment for Chicago baseball, just behind the time the company's street view cameras caught Lou Piniella headed down Clark Street for lunch.