Victorian schoolgirl presenting math at the classroom blackboard

A cinematic medium shot focusing on a single 19-year-old Victorian girl as the central subject, standing confidently in front of a large, dark slate blackboard in a sunlit classroom. She is in the middle of a presentation, holding a wooden pointer and gesturing towards complex mathematical equations and diagrams drawn in white chalk on the board. She is dressed in a sophisticated high-collared lace blouse and a dark pleated skirt, looking towards her audience with a poised and intelligent expression. In the softly blurred background, several students are seated at their desks, watching her attentively, appearing as indistinct, out-of-focus figures. Warm, volumetric sunlight streams through the tall arched windows, illuminating the dust motes around her.