Which innovative book packaging format, introduced in 1935 by Penguin Books, revolutionized the publishing industry by making literature more accessible and affordable to the general public?

In the world of publishing and literature, product packaging plays a crucial role in attracting readers and boosting sales. Throughout history, certain innovations in book packaging have transformed the industry and changed how we consume literature. This trivia question explores one of the most significant packaging revolutions in publishing history that altered reading habits worldwide.

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The paperback book with standardized cover designs and pricing
The leather-bound collector's edition with gold leaf pages
The audiobook on vinyl records for literary classics
The spiral-bound illustrated novel with pull-out maps