Although compressing a complex concept down to a short term obviously isn't lossless compression, I hadn't considered how confusing the illusion of transparency might be. I would have strongly preferred that "Thinking Fast and Slow" continue to use the words "fast" and "slow". As such, these were quite novel points:

• they don't immediately and easily seem like you already understand them if you haven't been exposed to that particular source

• they don't overshadow people who do know them into assuming that the names contain the most important features

The notion of using various examples to "triangulate" a precise meaning was also a new concept to me too. It calls to mind the image of a Venn diagram with 3 circles, each representing an example. I don't think I have mental models for several aspects of learning. Gwern's write up on spaced repetition gave me an understanding about how memorization works, but it hadn't occurred to me that I had a similar gap in my model (or lack thereof) for how understanding works.

(I'm not sure the triangulation metaphor lends much additional predictive power. However, an explicit model is a step up from a vague notion that it's useful to have more examples with more variety.)