With cute tulle tutus and little pink slippers the girls in Miss Tilly’s ballet classes twirl and plie as thousands of girls have before them. Miss Tilly has been teaching ballet to the preschool and kindergarten girls (and a few boys too) of San Francisco for forty years. She doesn’t need to advertise, the school is a city institution passed along by word of mouth. Her classes are age appropriate, starting off with a pencil puppet show. And every year she books the Herbst Theatre for her students to show off what they’ve learned.