I keep my index cards in chronological order : the newest card comes at front of the card box. All cards are clasified into four kinds and tagged according to the contents. The sequence is equivalent to my cultural genetic code. Although it may look chaotic at the beginning, it will become more regulated soon. Don't be afraid to sweep out your mind and capture them all. Make visible what is going on in your brain. Look for a pattern behind our life.

Ronald Reagan also kept a similar system that apparently very few people knew about until he died. In his system, he used 3×5 notecards and kept them in a photo binder by theme. These note cards–which were mostly filled with quotes–have actually been turned into a book edited by the historian Douglas Brinkley. These were not only responsible for many of his speeches as president, but before office Reagan delivered hundreds of talks as part of his role at General Electric. There are about 50 years of practical wisdom in these cards. Far more than anything I’ve assembled–whatever you think of the guy. I highly recommend at least looking at it.

They were input laboriously by hand either on punched cards, with each card holding up to eighty characters or one line of text (uppercase letters only), or on paper tape, where lower-case letters were perhaps possible but which could not be read in any way at all by a human being. Father Busa has stories of truckloads of punched cards being transported from one center to another in Italy. All computing was carried out as batch processing, where the user could not see the results at all until printout appeared when the job had run.

Your post says nothing at all to suggest Luhman didn’t “invent” “Zettelkasten” (no one says he was only one writing on scraps of paper), you list two names and no links

Forty years ago, Michel Foucault observed in a footnote that, curiously, historians had neglected the invention of the index card. The book was Discipline and Punish, which explores the relationship between knowledge and power. The index card was a turning point, Foucault believed, in the relationship between power and technology.

In 1780, two years after Linnaeus’s death, Vienna’s Court Library introduced a card catalog, the first of its kind. Describing all the books on the library’s shelves in one ordered system, it relied on a simple, flexible tool: paper slips. Around the same time that the library catalog appeared, says Krajewski, Europeans adopted banknotes as a universal medium of exchange. He believes this wasn’t a historical coincidence. Banknotes, like bibliographical slips of paper and the books they referred to, were material, representational, and mobile. Perhaps Linnaeus took the same mental leap from “free-floating banknotes” to “little paper slips” (or vice versa).

according to Charmantier and Müller-Wille, playing cards were found under the floorboards of the Uppsala home Linnaeus shared with his wife Sara Lisa.

In 1791, France’s revolutionary government issued the world’s first national cataloging code, calling for playing cards to be used for bibliographical records.

Linnaeus may have drawn inspiration from playing cards. Until the mid-19th century, the backs of playing cards were left blank by manufacturers, offering “a practical writing surface,” where scholars scribbled notes, says Blair. Playing cards “were frequently used as lottery tickets, marriage and death announcements, notepads, or business cards,” explains Markus Krajewski, the author of Paper Machines: About Cards and Catalogs.

Linnaeus experimented with a few filing systems. In 1752, while cataloging Queen Ludovica Ulrica’s collection of butterflies with his disciple Daniel Solander, he prepared small, uniform sheets of paper for the first time. “That cataloging experience was possibly where the idea for using slips came from,” Charmantier explained to me. Solander took this method with him to England, where he cataloged the Sloane Collection of the British Museum and then Joseph Banks’s collections, using similar slips, Charmantier said. This became the cataloging system of a national collection.

More than 1,000 of them, measuring five by three inches, are housed at London’s Linnean Society. Each contains notes about plants and material culled from books and other publications. While flimsier than heavy stock and cut by hand, they’re virtually indistinguishable from modern index cards.

Towards the end of his career, in the mid-1760s, Linnaeus took this further, inventing a paper tool that has since become very common: index cards. While stored in some fixed, conventional order, often alphabetically, index cards could be retrieved and shuffled around at will to update and compare information at any time.

Linnaeus had to manage a conflict between the need to bring information into a fixed order for purposes of later retrieval, and the need to permanently integrate new information into that order, says Mueller-Wille. “His solution to this dilemma was to keep information on particular subjects on separate sheets, which could be complemented and reshuffled,” he says.

This system was invented by Carl Linnaeus,[1] around 1760.

Dafür spricht das Credo des Literaten Walter Benjamin: Und heute schon ist das Buch, wie die aktuelle wissenschaftliche Produktionsweise lehrt, eine veraltete Vermittlung zwischen zwei verschiedenen Kartotheksystemen. Denn alles Wesentliche findet sich im Zettelkasten des Forschers, der's verfaßte, und der Gelehrte, der darin studiert, assimiliert es seiner eigenen Kartothek.

Media theorist Markus Krajewski has devoted a book specifically to the paper machinery of cards and catalogs. He traces the origins of this machinery back to sixteenth-century attempts at indexing books, and through the twists and turns of library technology in Europe and the U.S. over the following centuries.

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Context notes are used as a map to a series of notes. A context note that outlines a more complex concept or broader subject, using links to other notes in the process. For example, while I’m reading a book, I build an outline of the things I find relevant, based on my highlights and notes of the book. Each of the outline’s items links to a separate note explaining the idea in more detail, and usually contains the highlighted text of the book.

The basic idea behind Zettelkasten is to build a repository of the knowledge you gain through the years. The idea is similar to what Paul Jun, of Creative Mastery, writes about keeping a Commonplace Book, or Ryan Holiday’s notecard system. Zettelkasten adds the powerful idea of linking notes to create a web of interlinked knowledge.

McCulloch was a confident, gray-eyed, wild-bearded, chain-smoking philosopher-poet who lived on whiskey and ice cream and never went to bed before 4 a.m.

His card was on the table