When my brother Laurence lived in Philadelphia, he had a passion for road rallies. These were vehicle races on the streets of the city, based more on navigation and teamwork than on speed. When you register for the rally, organizers give you a list of directions for the course. But these are not typical directions. Rather than say, “Turn right at 16th Street,” they might say, “Hang a roscoe at the big bull’s eye.” Hanging a roscoe means, of course, turn right. The “big bull’s eye” could be a retail store logo, your landmark. In Pittsburgh you might be directed to hang a louie at the big bird, and you would turn left at the Giant Eagle grocery store.