The image depicts an interior scene within a university lecture hall, identified by the Bulgarian text on the projection screen describing "Trigonometric leveling," "Influence of the Earth's curvature and refraction," and "Determination of refraction

The image depicts an interior scene within a university lecture hall, identified by the Bulgarian text on the projection screen describing "Trigonometric leveling," "Influence of the Earth's curvature and refraction," and "Determination of refraction." This specialized technical subject matter strongly suggests the location is the University of Architecture, Civil Engineering and Geodesy (UACEG) in Sofia, Bulgaria. In the immediate foreground, a person's left hand is partially visible, with the thumb and index finger raised above a brown wooden desk. On the desk, a small, partially consumed plastic bottle of Coca-Cola stands upright. A blue ballpoint pen lies horizontally on the desk to the right of the bottle. The midground shows the backs of several students seated at dark-colored desks, facing the front of the room. Their attire includes a black top with "Aloha" text visible on one student and an off-the-shoulder white top on another. The background features a white projector screen displaying the aforementioned Bulgarian text and an accompanying graphic. To the right of the screen, an older Caucasian male, presumably a lecturer, stands facing the seated students. He is dressed in a plaid shirt over a dark garment and light-colored trousers. The room's walls are paneled with light brown wood. A large window with venetian blinds is visible on the left wall, admitting natural light. Fluorescent light fixtures are present on the ceiling. A dark wooden door is situated to the right of the lecturer.