-"category boundaries" were just a visual metaphor for talking about beliefs? There's a little naive Bayes model in my head with "blueness" and "eggness" observation nodes hooked up to a central "blegg" category-membership node, such that I can use observations to update my beliefs about category-membership, and use my beliefs about category-membership to predict observations. The set of things I'll classify as a blegg with probability greater than p is conveniently visualized as an area with a boundary in blueness–eggness space, but the beliefs are the important thing.
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-The "borders" metaphor is particularly galling if—[unlike the popular author](https://slatestarcodex.com/2015/01/31/the-parable-of-the-talents/)—you actually know math.
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-https://www.lesswrong.com/posts/hzuSDMx7pd2uxFc5w/causal-diagrams-and-causal-models
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