Which classic publishing brand underwent a major repositioning in 2016 with a minimalist redesign that featured color-coded spines, creating a collectible 'rainbow' effect that significantly boosted sales?

The publishing industry has undergone remarkable transformations in how literary works are branded and marketed. From classic publishing houses establishing distinctive identities to modern author brand-building strategies, the business of books has evolved dramatically. This trivia question explores a fascinating brand repositioning that revitalized a classic literary institution and changed how readers engage with a beloved catalog of works.

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Penguin Classics
Oxford World's Classics
Library of America
Norton Critical Editions