Vladimir Nabokov's index cards
"The legendarily meticulous Nabokov spent a couple of fertile decades filling index cards with careful paragraphs, which he then revised and shuffled into complete novels. When he died, he left one last batch: 138 cards, a partial draft. After some Pale Fire–worthy jockeying (a request that they be destroyed after his death, popular calls to publish them, 30 years in a Swiss vault), those cards will now be published. It’s a unique chance to see the perfectionist in imperfection."