Which publishing innovation transformed the brand identity of classic literature in the early 20th century, making books more accessible and recognizable through standardized designs and affordable pricing?

In the competitive world of publishing and literature, brand identity has become increasingly crucial for authors and publishers alike. From distinctive book covers to recognizable typography and marketing strategies, literary branding helps authors stand out in a crowded marketplace. This trivia question tests your knowledge about a significant brand identity transformation in the publishing world that changed how we interact with classic literature.

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Penguin Books' color-coded paperback system, introduced by Allen Lane in 1935
Random House's 'Modern Library' hardcover collection, launched in 1917
Harper & Brothers' 'Harper Torchbooks' academic paperback series from 1955
Oxford University Press's 'World's Classics' series redesign in 1906