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A cataloguing block states subjects in Library of Congress form, which is precise, deep and no use for browsing. Real blocks from this library read 'Political science – Early works to 1800' and 'English literature—Middle English, 1100–1500—History and criticism'. Nobody has a shelf called that. --shelf takes the closed list the library is actually browsed by and files the printed headings onto it, longest term first so a period of thought does not collapse into its parent. Matching is on whole words after folding punctuation away, because a cataloguing block separates with em dashes, en dashes, full stops and plain hyphens, often three in one heading, and OCR turns any of those into any other. What matches nothing comes back under unshelved rather than being dropped: a subject silently discarded is indistinguishable from a book that printed none, and the difference is the whole value of reading the block.