I have been spending a great deal of time in downtown Los Angeles lately, moving back and forth between the Central Criminal Courts Building and the Men’s Central Jail. If you keep your eyes open in that neighborhood, you start noticing something everywhere. Young people, mostly Hispanic kids, walking around with backpacks full of spray paint like painters carrying their brushes. Look closely and you realize graffiti is not just one thing. There are really two kinds. One kind is careful, deliberate, and surprisingly beautiful. Real artwork. Colors layered on top of colors. Shapes and lettering that clearly took time, patience, and skill. The other kind is the territorial kind. The quick tags that mark the invisible borders of street gangs. That type is less about beauty and more about staking a claim. But the artists. The real ones. They treat the city like a canvas. Any blank wall, bridge column, or stretch of fence becomes an invitation. And sometimes they place their work in pla...