All I know is a door into the dark.

Outside, old axles and iron hoops rusting;

Inside, the hammered anvil’s short-pitched ring,

The unpredictable fantail of sparks

Or hiss when a new shoe toughens in water.

The anvil must be somewhere in the centre,

Horned as a unicorn, at one end and square,

Set there immoveable: an altar

Where he expends himself in shape and music.

Sometimes, leather-aproned, hairs in his nose,

He leans out on the jamb, recalls a clatter

Of hoofs where traffic is flashing in rows;

Then grunts and goes in, with a slam and flick

To beat real iron out, to work the bellows.