Supernumerary body part considered to have lost much or all of their original function through evolution. These body parts can be classed as additional to the required functioning of the body. In human anatomy the vermiform appendix is sometimes classed as a vestigial remnant. Prosthesis is an artificial extension that replaces a body part, and cybernetics is the study of computer technology in relation to organisms which can include replacement or additional body parts. Body integrity identity disorder (BIID) is a psychiatric disorder in which a person thinks that they have one or more additional limbs than they should, despite having two arms
The King of Limbs made Donwood think of "immense multicoloured cathedrals of trees, with music echoing from the branches whilst strange fauna lurked in the fog". Donwood and Yorke drew trees with eyes, limbs, mouths, and familiars, creating "strange, multi-limbed creatures that are neither malevolent or benevolent", inspired by Northern European fairy tales. For the special "newspaper" edition of "The King of Limbs", Donwood wanted to create something "in a state of flux". He chose newspaper, which fades in sunlight, for "its ephemeral nature"; this reflected the album's nature themes, mirroring the natural decay of living things. To design the newspaper, Donwood took inspiration