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An indoor scene in Sliven, Bulgaria, features a large educational display board demonstrating "MODULAR DEVICES FOR ELECTRICAL INSTALLATIONS IN RESIDENTIAL AND COMMERCIAL BUILDINGS" by ETI. The white display board, approximately 1.8 meters tall, shows a cutaway diagram of a house with various functional electrical components, including dimmers (DIM-14, DDM-15), switches (SOU-1 twilight, CRM-4 staircase), relays (HR-41 memory and latching, CRM-91H and CRM-2H time), spotlights, and exhaust fans. Each component is labeled with its function and model number. Lines representing wiring connect these devices to green indicator lights.

To the left of the main display, a white, rectangular device with "ETI" branding, possibly a small heater or supplementary display, rests on the floor, partially encased in clear plastic film.

The background consists of two light-colored wooden shelving units. The left unit displays various light bulbs, including a "LIGHTEX" packaged bulb, and other electrical components on its top shelf. The right unit's top shelf holds a large silver floodlight, an analog meter with a black face, and additional electronic equipment.

The floor is covered with a mottled, light-colored linoleum or similar material, exhibiting wear and a distinct rust-colored stain to the right of the display board. Two wooden chairs with metallic frames are visible in the foreground; one on the left has a dark bag partially resting on its seat, and only the lower half of the chair on the right is visible. No individuals are present in the scene.
Kostov Photography

Mar 12, 2026

Sliven, Bulgaria

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An indoor scene in Sliven, Bulgaria, features a large educational display board demonstrating "MODULAR DEVICES FOR ELECTRICAL INSTALLATIONS IN RESIDENTIAL AND COMMERCIAL BUILDINGS" by ETI. The white display board, approximately 1.8 meters tall, shows a cutaway diagram of a house with various functional electrical components, including dimmers (DIM-14, DDM-15), switches (SOU-1 twilight, CRM-4 staircase), relays (HR-41 memory and latching, CRM-91H and CRM-2H time), spotlights, and exhaust fans. Each component is labeled with its function and model number. Lines representing wiring connect these devices to green indicator lights. To the left of the main display, a white, rectangular device with "ETI" branding, possibly a small heater or supplementary display, rests on the floor, partially encased in clear plastic film. The background consists of two light-colored wooden shelving units. The left unit displays various light bulbs, including a "LIGHTEX" packaged bulb, and other electrical components on its top shelf. The right unit's top shelf holds a large silver floodlight, an analog meter with a black face, and additional electronic equipment. The floor is covered with a mottled, light-colored linoleum or similar material, exhibiting wear and a distinct rust-colored stain to the right of the display board. Two wooden chairs with metallic frames are visible in the foreground; one on the left has a dark bag partially resting on its seat, and only the lower half of the chair on the right is visible. No individuals are present in the scene.

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Kostov Photography

Mar 12, 2026

Sliven, Bulgaria

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