If you know San Francisco, you know the area called the Tenderloin isn't pretty and it's a tough place to live. But there is a corner that is beautiful because of the efforts of a street artist named Jet Martinez. Mr. Martinez has painted a garden of flowers along two long building walls in this dark and grimy place. In doing so he has given its residents and visitors a reminder about the healing power of generosity and the art of the street. It's a powerful gift.