Understanding Is Translation Not Storage

November 3, 2024

Learning is not about moving information from a book into your brain. It is about translating ideas across contexts until they become part of how you think.

"Writing good prompts feels surprisingly similar to translating written text. You're asking: which words, when read, would light a similar set of bulbs in readers' minds?" Andy Matuschak, How to Write Good Prompts

Matuschak's analogy between prompt-writing and translation captures something fundamental about cognition. Understanding is not storage; it is the ability to re-express an idea in a new context. When you translate a passage into another language, you cannot go word by word you must grasp the meaning and reconstruct it. The same is true when you write a permanent note, craft a spaced repetition prompt, or explain an idea to a friend. Each of these acts is a translation, and each one deepens understanding precisely because it demands reconstruction rather than reproduction.

This is why Ahrens argues that the slip-box method is not about storing information externally so your brain doesn't have to. It is about forcing the kind of elaborative encoding that makes knowledge stick. "The slip-box takes care of details and references. That allows the brain to focus on the gist, the deeper understanding and the bigger picture." The division of labor between brain and external system is not offloading it is specialization. Your brain handles pattern recognition and meaning-making; the system handles fidelity and retrieval.

Michael Nielsen makes the same point about Anki: constructing your own cards is itself a form of elaborative encoding. Using someone else's deck skips the translation step, and with it, most of the learning. The act of deciding what to ask and how to phrase it is where understanding crystallizes.

Takeaway: Every time you translate an idea into a new form a note, a prompt, a conversation you understand it a little more deeply than before.