These yellow metal boxes hold utility meters and are mounted on every house.
They are magnets for graffiti. I wondered where this bit of graffiti came from.
But it turns out (is this common knowledge for everyone except for me?) that the former Yugoslavia was a basketball powerhouse. We finally watched "Once Brothers," the ESPN/NBA movie about two members of the Yugoslavian national team who became NBA stars together and then saw their friendship evaporate during the Yugoslavian civil war. A powerful film.