A new Android app helps librarians keep their shelves in order.
"Shelvar relies on special tags—kind of like QR codes—attached to the books’ spines. Each tag 'exactly represents the call number' of each book, Mr. Brinkman explains. A user with a current-generation smartphone or tablet computer scans the shelf using the app, and Shelvar indicates which books aren’t in the right places. Visual cues, including directional arrows, indicate where the misfiled book ought to go."
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