Which innovative product packaging decision by Penguin Books in the 1930s revolutionized the publishing industry and made literature more accessible to the average reader?

In the publishing world, brand recognition has been crucial to success for decades. One of the most iconic publishing brands underwent a significant transformation that changed how readers interact with literature. This poll tests your knowledge about a revolutionary branding decision that democratized access to quality literature and created one of publishing's most recognizable symbols.

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Introducing standardized color-coded covers for different genres (orange for fiction, blue for biographies, etc.)
Creating the first leather-bound collector's editions with gold leaf embossing
Pioneering dust jackets with author photographs as the primary cover design element
Developing scented paper that released aromas related to the book's content