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Nice link, for anybody coming to the comments first, it isn't a sample of linux system layouts as I thought.

I thought it'd be about Lie groups!

https://en.wikipedia.org/wiki/Root_system

The context of HN is interesting. We see the word “root” and immediately assume it has to do with a filesystem or math… but not actual, physical roots haha

Or other math! https://en.wikipedia.org/wiki/Root_of_unity

I was convinced it was about trees, just not ... that kind of tree!

I thought it'd be about the superuser account.

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