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Schrodinger's library

An ante-anti-library, perhaps?

When I was a CS student we used to joke that a friend of ours organized his room in the form of a novel data structure, a bit like a heap but unstructured, called a tip[0]. It would be perfect for storing unopened mail.

[0]https://www.collinsdictionary.com/dictionary/english/rubbish...

A tip is essentially an LRU cache:

https://www.ft.com/content/e6f82da0-8b4d-11e6-8cb7-e7ada1d12...

(I first heard about this concept ages ago, but that's the first article on Google; sorry if paywalled).