Which revolutionary product design innovation in the 1930s made books more affordable and accessible to the general public?

In the world of arts and literature, product design plays a crucial role in how we experience books. From illuminated manuscripts to modern e-readers, the physical form of literature has evolved dramatically over centuries. This poll tests your knowledge about a pivotal innovation in book design that transformed the publishing industry and made literature more accessible to the masses.

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Paperback books (Penguin Books' standardized format)
Leather-bound embossed covers with gold leaf
Hardcover books with dust jackets
Spiral-bound manuscript design