the.com/bookend

The unsung bodyguard standing between order and an avalanche of paperbacks

means A weighted or braced support placed at the end of a row of books to keep them upright, or by extension either of two things marking the start and finish of something.

from A plain compound from English: 'book' (Old English bōc, the same word that gave us the leaf-and-page sense) plus 'end' (Old English ende). The literal object-name arrived alongside the rise of the home library and the upright shelf — books only need an 'end' to stop them sliding when they stand spine-out rather than lying flat. The figurative sense, two matching events framing a stretch of time, grew naturally from the picture of a pair holding everything in between.

physics
Works only if heavier than the books it stops
origin
Popularized once cheap printing flooded homes with books
language
Means to flank something at both ends
design
Often sold in pairs, frequently used solo
materials
Made from marble, cast iron, even repurposed bricks
for instance

don quixote — cervantes' 1605 novel, often cited as the first modern novel, paired with its 1615 sequel as literary bookends

the odyssey and iliad — homer's two epics that frame ancient greek literature, composed around 8th century bce

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