Everywhere he drives there are signs, including the middle-class neighborhoods of the Ville and Penrose Park. At the corner of Euclid and Farlin avenues, the exterior of Mr. J.’s Clothing Store is covered with graffiti. Osby translates the cryptic messages. “Those are the Rolling 20s. A guy named K-9 is dead. That RIP means rest in peace, K-9. If you ride and read the walls, you can find out what’s going on in a neighborhood. The walls tell it all.