Which revolutionary product design innovation, launched by Penguin Books in 1935, made quality literature more affordable and portable for the average reader?

Before e-readers and print-on-demand technology revolutionized the publishing world, the physical design of books was a crucial marketing and artistic decision. From embossed leather covers to paperback innovations, the evolution of book design has shaped how we interact with literature. Test your knowledge about a pivotal moment in book product design history that transformed the accessibility of literature!

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Standardized paperbacks with uniform cover designs priced at sixpence (comparable to the price of a pack of cigarettes)
Leather-bound collector's editions with gold leaf pages sold through subscription services
Illustrated hardcover books with detachable dust jackets that doubled as promotional posters
The 'book-of-the-month' service delivering serialized novels in weekly newspaper format