Template:Dewey decimal system
The Dewey decimal system divides the universe, known and unknown[1] into a subdivisions of 1,000. In its way, it offers infinite particularity, but only by subdivision of ten major categories: General reference, Philosophy, Religion, Social Sciences, Language, Natural Science, Applied Science, Arts & Recreation, Literature and History.
These major categories produce arbitrary dis-juxtapositions: Why is logic (part of Philosophy) nowhere near mathematics (a part of Natural Science) or even Language? And so on. But we were practically committed, by how we physically arranged our libraries, and that forced an intellectual commitment.