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Each bar is one book of the Hebrew Bible, as long as its words. Each spark is a word that stands in that one place and nowhere else in the whole Hebrew Bible.
It is the glory of God to conceal a thing; But the glory of kings is to search out a matter.Proverbs 25:2 (ASV)
The Leningrad Codex, from the Open Scriptures Hebrew Bible, where every word is tagged with its dictionary entry.
A dictionary entry that stands in exactly one place in the written text. The small joined parts of a word (such as "and" or "the") are not counted. Names used once are not sparks, since a man named once is not a rare word. They are counted apart: 1,120 names.
Bars are in Tanakh order and drawn to one scale, so a longer bar is a longer book.
Scholars usually count rare words by their root, and that count is lower. This picture uses the tags in the text, which split some words into separate entries.