I'm trying to get a grasp of a poetical image of being "packed in furnace", found in Ted Hughes' Crow's opening poem "Two Legends":
Black was the without eye
Black the within tongue
Black was the heart
Black the blood in its loud tunnel
Black the bowels packed in furnace
During my Googling, I came across this work, which suggests:
'packed in furnace' recalls Thomas' sea, 'tumbling in harness'.
This quote is from Dylan Thomas' "A Refusal to Mourn the Death, by Fire, of a Child in London":
Never until the mankind making
Bird beast and flower
Fathering and all humbling darkness
Tells with silence the last light breaking
And the still hour
Is come of the sea tumbling in harness
I have no idea in what way does the "packed in furnace" image can recall the "tumbling in harness" image.
Can this analogy make sense in some way?