Heart of darkness they were discoloured just awash and the whole lot was seen just under the water exactly as a mans backbone is seen running down the middle of his back under the skin

Answer: Personafication

Explanation: Personafication means referring to or giving non living things the qualities of human or living things. "Heart of darkness they were discoloured", the heart is part of the human body but in this context it is given the human attribute where "they" pronoun is referred to the heart. Also "backbone is seen running down the middle of his back", backbone is just part of the human body but in this context it it made to run down like it ia literally running down onea back.