Permanent (or Evergreen) notes are permanent not because the content don’t change, because, like you said, knowledge is an ever-evolving animal. What is permanent is their potential participation in the creation of future insights.
I prefer the term “Evergreen notes”, because there are several properties associated with the concept. Evergreen notes are atomic, concept-oriented, densely linked. Basically, when written with those properties in mind, a note qualify as an evergreen note, because these properties enable insights (or new knowledge) to take place.
The mechanism by which insight takes place is an interesting one, I am working on clarifying how insights, such as defined by the body of research on insight problem solving, can be facilitated by evergreen notes. It’s not serious, hardcore research, just something I’ve been flexing out.
Here’s an excerpt (with slight rewording) from my blog post Beginner’s guide to serious note taking which I think is relevant.
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Developing evergreen notes help create shifts in perceptions which produce insights
How does evergreen notes enable insights ? Insight is an unexpected shift in perception that leads to a better story. A story is a representation. A representation is distribution of activation across pieces of knowledge in memory [1]. Basically, we change our perception of a story by changing how pieces of knowledge (ideas) are activated. And activation of an idea is closely linked to how it’s connected to other ideas, so we must change how ideas connect to one another. When we do this in our mind, it amounts to thinking (loosely speaking).
Evergreen notes are atomic, concept-oriented and densely linked to other ideas. Evergreen notes can be used as components of our perceptions. More importantly, they are externalized perceptions, which mean we can concretely integrate, contrast, modify, refine them. Evergreen notes enable the possibility of manipulating how ideas connect together in an external environment.
Interestingly, the observed suddenness of insight is more likely an epiphenomenon, and in fact the brain gradually gets closer and closer to insights [2]. This is important because it means that insight is something that we can make incremental progress towards. Each increment is made by refining evergreen notes and their connections.
So, to summarize, developing evergreen notes amounts to developing our own perceptions. The process of development create changes in perceptions, which when experienced as a shift to a better story about the world, are insights.
References
[1] Jones, Gary. (2003). Testing Two Cognitive Theories of Insight. Journal of experimental psychology. Learning, memory, and cognition. 29. 1017-27. 10.1037/0278-7393.29.5.1017.
[2] Bilalic, M., M. Graf, N. Vaci and Amory H. Danek. “The temporal dynamics of insight problem solving – restructuring might not always be sudden.” Thinking & Reasoning (2019): 1-37.
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Here’s another blog post of mine that touches on insight, in case you’re interested:
Hopefully that helps !