A lecture hall at the University of Architecture, Civil Engineering and Geodesy (UACEG) in Sofia, Bulgaria, is depicted

A lecture hall at the University of Architecture, Civil Engineering and Geodesy (UACEG) in Sofia, Bulgaria, is depicted. A multi-panel blackboard, predominantly black, covers the upper mid-section of the image, densely filled with white chalk diagrams and equations related to structural mechanics, including force calculations, beam analyses, and equilibrium statements (ΣFx, ΣFy, ΣM). A male individual with gray hair, wearing a dark long-sleeved shirt, is positioned on the far right, actively writing on the blackboard with a piece of chalk. A pink eraser is visible near his right hand. Below the blackboard, a light-colored counter extends horizontally, upon which a black object rests to the left of the writer. To the left of the counter, a brown wooden podium with a vertical stand is present. The brown paneling below the counter bears the number "1914" written in white chalk, signifying the institution's historical founding. The tops of two individuals' heads are partially visible in the bottom-left foreground, indicating an audience. The wall above the blackboard is painted white with minor discoloration.