A classroom or lecture hall in Plovdiv, Bulgaria, is depicted

A classroom or lecture hall in Plovdiv, Bulgaria, is depicted. The room features white walls, a light gray tiled floor, and ceiling-mounted fluorescent strip lighting fixtures. A digital projector, also mounted on the ceiling, casts an image of mathematical equations, including integrals and functions, onto a white screen at the front of the room. An older male, dressed in a dark jacket, is seated at a light-colored desk to the left of the projection screen, facing the student seating area. Rows of light teal desks with white laminate tops and matching chairs are arranged throughout the room. In the immediate foreground, a student is viewed from behind, wearing a black puffer jacket, black track pants with a white Nike swoosh on the left thigh, and black athletic shoes with pink/orange accents on the soles. This individual is seated at a desk, leaning forward. Further into the room, two male students are visible in the mid-ground. One, wearing a white t-shirt with a dark wing graphic on the back, is seated at a desk with his head oriented downwards, appearing to be focused on materials on his desk, where a plastic water bottle is also present. Adjacent to him, another male student in a dark jacket is seated, facing towards the front of the classroom. A dark brown door with an overhead green exit sign is located on the right wall, and a light gray metal cabinet stands against the left wall.