Which revolutionary change in book cover design was introduced by Penguin Books in the 1930s that transformed how literature was marketed and made books more accessible to the general public?

Book covers are crucial marketing tools in the publishing industry, serving as the first point of contact between a literary work and potential readers. Great cover design can significantly influence sales and reader perception. This poll tests your knowledge about the fascinating intersection of product packaging and literary marketing - specifically how publishers package and present books to attract readers in an increasingly competitive market.

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Standardized pocket-sized paperbacks with color-coded covers based on genre
Embossed leather covers with gold lettering that made books look like luxury items
First use of author photographs as the primary cover design element
Introduction of transparent dust jackets that revealed portions of the actual book cover