Which publisher first introduced the now-iconic color-coded book spines as a branding strategy, allowing readers to identify their publications by sight alone on bookstore shelves?

The publishing industry has seen remarkable branding innovations that transformed how literature is marketed and consumed. Major publishing houses and independent imprints alike have created distinctive brand identities that readers recognize instantly. This poll tests your knowledge about a significant branding revolution that changed how we identify quality literature at a glance.

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Penguin Books with their orange and white paperbacks
Folio Society with their rainbow classification system
Oxford University Press with their blue academic series
Vintage Classics with their red and black design scheme