In a rehearsal space in Kigali, Rwanda, the atmosphere shifts the moment the music begins. Feet shuffle across the floor. Arms stretch into graceful shapes. Laughter echoes between takes. The room is alive with movement, nerves, and excitement. In the middle of it all are young performers discovering that something they once did for fun could become much more. For Sherrie Silver, the award-winning, Rwandan-born British choreographer behind Child…