One Wrong Word

The Forge
by Seamus Heaney
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...