Which revolutionary design element was introduced by Penguin Books in 1935 that became central to their brand positioning and changed how readers identified quality literature?

Penguin Books revolutionized publishing with its affordable paperbacks and distinctive brand identity. Founded in 1935, the publisher made quality literature accessible to the masses through innovative distribution and iconic design. This poll tests your knowledge of how this literary giant positioned its brand in the competitive publishing landscape and created one of the most recognizable logos in arts and literature.

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The three horizontal color bands with the Penguin logo in the center white band
The first use of illustrated book covers for classic literature
The introduction of author photographs on all book spines
The use of color-coding to indicate literary genre (green for crime, orange for fiction)