In John Hall’s classroom at ArtSpace Charter School , in Swannanoa, there’s an equation stamped in dark capital letters high up one green wall: Vision + perseverance = impact. Hall teaches social studies, not math, so perhaps that’s why he’s found this equation elusive in his own life. He’s pursued some things and persevered in others. They just haven’t always aligned. “I knew I enjoyed performing. I didn’t know I wanted to try to make a living at it,” he said. “I really had no plan. I was quite