It really is thick-skinned.
In Saitama Prefecture lies the humble city of Kawaguchi. At a time when the foundry industry was thriving around the middle of the 20th century, this city was at the forefront of metal casting.
It was said that up until the 80s the skyline of the city was heavily dotted by the coke fires of its many small blast furnaces that resemble smoke stacks — known as cupolas.
▼ Kawaguchi was the setting for the 1962 drama The City Where Cupolas Are (Kyupora no Aru Machi).
Those flames have since been replaced