Which publishing house pioneered the use of color-coded spines as a brand identity strategy, allowing readers to identify their classic literature collection at a glance?

In the competitive world of publishing, branding plays a crucial role in how readers discover and connect with books. Publishing houses have developed distinctive visual storytelling techniques to set their literary offerings apart. This trivia question explores an innovative brand positioning strategy that revolutionized how readers identify quality literature at a glance. Test your knowledge about this famous publishing brand story that changed how we visually recognize books on shelves worldwide.

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Penguin Books with their orange and white design for classics
Random House with their blue and gold medallion design
HarperCollins with their green leaf spine design
Oxford University Press with their dark red leather-look covers