Which publisher's distinctive orange book covers became so iconic in the 20th century that the color alone created instant brand recognition and was protected as a trademark for decades?

Throughout publishing history, certain book cover designs and branding approaches have become iconic, creating instant recognition and driving sales through visual identity. Publishers and authors understand that a book's packaging can be as important as its content in capturing audience attention. This trivia question explores a famous example of color-based brand identity in the literary world that revolutionized how books are marketed and recognized on shelves.

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Penguin Books
Random House
HarperCollins
Simon & Schuster