Which innovative book packaging technique, first widely popularized in the 2010s, significantly boosted sales by creating collectible editions with special features like colored page edges, reversible dust jackets, and exclusive content?

In the publishing world, packaging innovations have dramatically influenced book sales and reader engagement. From traditional hardcovers to modern special editions, the way books are presented physically has evolved to create distinctive market appeal. This trivia question explores a groundbreaking packaging innovation that changed how readers interact with literary works and created new revenue opportunities for publishers.

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Book subscription boxes (like OwlCrate and Illumicrate)
Interactive augmented reality covers
Minimalist single-color jacket designs
Edible rice paper page inserts