As headlines have been informing us recently, censorship is very much alive and well across the United States—but there’s a difference between a book you’re not allowed to read and one you simply can’t read. The subset of non-censored reading material out there that actively seems to dare readers to make any sense of it is deep and vast. From codices to puzzles to straight-up art projects, books that aren’t meant to be read (or are essentially impossible to read) present the bibliophile with a true conundrum: Just how hard should you have to work to read and enjoy a book?
Here, then, are six publications that you’re free to try to track down, but which have a seriously select group of readers nonetheless…