You can lose entire days while researching the Voynich Manuscript on the Internet, so maybe you should begin with this overview of the matter – one that asks whether or not the entire thing is just a big hoax.
World-building is an essential part of any story, but what about map-making? At Book Riot, two cartographers explain how they create the maps we see inside books. One cartographer’s perspective: “I really wanted to make a map that could easily be an artifact from the world of the book…. I came up with the idea that the map could be a page ripped from an atlas, and someone had written notes on it.” See also: Rob Goodman’s essay for the reader on world-building and its relationship to reality.
Recommended reading: The Awl takes a look at the “attempt to create a completely logical, absolutely universal language,” which goes about as well as you’d expect (read: not very).
“What a horrible silent noisy people they are … My feeling toward those mice is flat-out fear. It has to do with the unexpected, unbidden, unavoidable, virtually silent, persistent, ulteriorly motivated appearance of these animals.” It looks like Franz Kafka really didn’t like mice. Reiner Stach, author of the definitive two-part biography of Kafka (The Decisive Years and The Years of Insight) has released a new book of Kafka ephemera called Is That Kafka? 99 Finds full of fascinating facts that never found a place in the biographies at large. This Millions review of Stach’s biographies might also suit your Kafka fancy.