Which major publishing house revolutionized its brand identity in 2012 by merging with Random House and introducing a minimalist door-shaped logo meant to represent 'the threshold of discovery'?

The publishing industry has evolved tremendously in how books and literary brands are marketed to consumers. From independent bookstores to major publishing houses, literary logos have become powerful symbols that readers instantly recognize. This trivia question explores how one famous publishing house transformed its brand identity through innovative logo design, creating one of the most recognizable symbols in literary retail history.

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Penguin Books
HarperCollins Publishers
Simon & Schuster
Hachette Book Group