Which iconic book series was the first to receive a complete brand redesign with consistent cover aesthetics across all titles, creating a revolutionary 'collectible' visual identity that influenced modern publishing?

The publishing industry has undergone dramatic transformations in how books are branded, marketed, and sold to readers. From distinctive cover designs to innovative marketing campaigns, publishers have developed sophisticated brand identity strategies to help books stand out in an increasingly crowded marketplace. This trivia question explores a pivotal moment in literary brand identity that changed how readers identify and collect certain books.

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Penguin Classics with their distinctive orange spines and minimalist typographic covers (1935)
Hardy Boys and Nancy Drew series with their blue and yellow silhouette covers (1959)
The Lord of the Rings trilogy with Tolkien's own illustrated covers (1954)
Agatha Christie mysteries with their Art Deco black and red designs (1967)