Joseph Djugashvili and the use of his blue pencil are the subjects of Holly Case’s article.
The editor is the unseen hand with the power to change meaning and message, even the course of history. Back when copy-proofs were still manually cut, pasted, and photographed before printing, a blue pencil was the instrument of choice for editors because blue was not visible when photographed. [This] …editorial intervention was invisible by design.
Apparently, Steve Jobs referred to himself as an editor; nytimes article is about twitter.
