Which innovative branding element, introduced by Penguin Books in 1935, revolutionized book marketing and made literature more accessible to the general public?

In the world of book publishing, branding has played a crucial role in how readers discover and connect with literature. One of the most influential publishing innovations of the 20th century transformed how books were marketed, distributed, and consumed by the masses. This trivia question explores a pivotal moment in literary retail history that democratized access to quality literature through revolutionary brand design and marketing strategy.

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The color-coded cover system (orange for fiction, green for crime, etc.)
The 'Read More' subscription box model
The first digital e-reader prototype
The rotating bookstore display carousel