Which innovative packaging design for books was first introduced in the 1930s and revolutionized access to literature by making books more affordable and portable?

The world of books and literary products has seen fascinating innovations in packaging design over the centuries. From ancient scrolls to modern collector's editions, how publishers present literature can be as artistic as the content itself. This trivia tests your knowledge about a groundbreaking packaging innovation that revolutionized how we interact with literary works. Think about memorable packaging designs that changed how we experience literature!

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Paperback books with glued bindings (Penguin Books)
Leather-bound collector's editions with gilt edges
Hardcover books with dust jackets
Spiral-bound books with plastic covers