Which literary packaging innovation of the 1930s was initially rejected by publishers as 'too radical' but went on to revolutionize reading habits and create a new retail category?

In the world of publishing, packaging design isn't just about aesthetics—it can revolutionize how literature reaches consumers. Some innovations in book packaging have transformed retail strategies and consumer behavior in the literary market. This trivia question explores a landmark packaging innovation that changed how people buy and consume literature, creating a whole new retail category and consumer behavior pattern.

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Paperback books (Pocket Books)
Dust jackets with cover art
Book club subscription boxes
Leather-bound collector's editions