PingMag has a great interview with Kogoro Kurata, a Japanese ironsmith whose works range from staircases to robots to typewriters to bulldozers, all of which seem to have come from a rusty dimension of grim, skeletal force.
One thing that gets me once in a while is just that the colour of iron is always black! [laughs] Sometimes it can be boring, so I would rather use wood. My basic material is always iron, but I'll use other materials as decoration to escape its monotone characteristic. On the other hand, I think the texture of iron is really important in my works so I don't paint them either. I'll probably always work with iron – as long as my body holds out! [laughs]