Smeden

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 square,
Set there immoveable: an altar.

(uit: Seamus Heaney, The Forge / Door into the dark)