The image depicts the interior of a confined, oven-like or stove-like compartment

The image depicts the interior of a confined, oven-like or stove-like compartment. The compartment features light grey, possibly refractory, walls and a base with distinct parallel ridges running front to back. Six cubic objects, intensely incandescent and glowing red-orange, are positioned on this ridged base. Three cubes are aligned in a row towards the front-right, with one slightly behind and to their left. Two additional cubes are visible further back towards the center and right. Scattered smaller embers, also glowing red, are present around the main cubic objects and in the background. The interior walls show some discoloration and darker areas, particularly on the back wall, which appears sooty. A small, dark circular opening or fixture is present on the upper portion of the back wall. The intense red glow from the coals illuminates the surrounding surfaces. No people or animals are visible. The specific location within the city of Sofia, Bulgaria, cannot be determined from the visual information provided in the image.