Meeting by Accident,we hovered by design.
These first two lines sum up, for me, the exact experience I have had so often, finding interesting books mostly by accident and the examination and research (the hovering) that follows.
…the book has been a sort of material storage unit through the age … [and] fragmented books have served in turn by being used to complete a less damaged or more important copy. Sometimes text material was used to line covers, or spines, or laminated boards….
Our protective enclosures also echo practices of the past when we add some sort of jacket to a book that has sustained cover and/or structural damage, or simply to protect a primary (initial) cover from further wear.