The Transfiguration classroom is built to withstand the unpredictability of the art of transfiguration. Its walls are bare of decoration, save for a few high windows that allow in steady light, fractured across the room by small cracks in the glass. At the front of the room, a broad teaching platform holds a blackboard, flanked by built-in shelves stacked with an assortment of objects: candles, goblets, quills, teapots, all waiting to be reshaped in lessons. Metal cabinets at the back house larger and more unusual materials for advanced work, their doors charmed to lock themselves after hours. The floor is polished stone, swept clean but still showing hairline cracks from spells gone awry.