Which publishing house first introduced the now-iconic standardized color-coded spine design system that dramatically increased brand recognition and consumer loyalty?

The publishing industry has evolved dramatically in how books are marketed and branded to consumers. Modern publishers invest heavily in distinctive cover designs, series branding, and visual identities that help books stand out in both physical and digital marketplaces. This trivia question explores how consumer behavior is influenced by one of the most recognizable branding elements in contemporary publishing. Test your knowledge of how visual identity shapes literary consumption patterns!

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Penguin Books (with their orange and white banded design)
Oxford University Press (with their dark blue academic spines)
Harlequin Romance (with their red diamond logo system)
Vintage Classics (with their patterned color blocking)