Which product design innovation was specifically created to make literature more accessible to the masses in the 1930s by drastically reducing production costs?

Throughout history, books have not just been about content but also revolutionary product design. From the invention of the paperback to modern e-readers, the physical design of books has evolved dramatically to enhance reader experience. This poll tests your knowledge about significant innovations in book design that transformed how we interact with literature. Can you identify which groundbreaking design approach revolutionized the publishing industry?

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The Penguin Paperback design by Allen Lane, featuring standardized sizing, affordable paper, and distinctive color-coding by genre
The leather-bound 'subscription edition' model popularized by Charles Dickens for his serialized novels
The Oxford University Press's 'Bible paper' design featuring ultra-thin pages with minimal bleed-through
The Linotype machine's text formatting capabilities that allowed for illustrated magazine-style layouts in books