Which major publishing house rebranded in 2012, replacing its dolphin logo with a simple white circle on a blue background to create a more 'timeless' look?

Publishing houses have developed distinct brand identities that book lovers often recognize instantly. These visual symbols not only represent the publisher but can also signal the type of literature a reader might expect. How well do you know the iconic logos and brand identities of major publishing houses that have shaped the literary landscape? Test your knowledge of the visual language of literature in this challenging trivia question!

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Penguin Random House
HarperCollins
Random House
Simon & Schuster