Which famous novel saw a 57% increase in sales after its publisher introduced a minimalist redesign that removed the traditional character portrait in favor of a simple, iconic symbol?

In the publishing industry, book cover redesigns are a significant product development strategy that can breathe new life into classic titles or reposition authors for new audiences. This trivia question explores a notable example where cover design dramatically influenced commercial success in contemporary literature.

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The Great Gatsby (F. Scott Fitzgerald) - with its blue cover featuring a face with glowing eyes
To Kill a Mockingbird (Harper Lee) - with its silhouette of a tree and bird motif
1984 (George Orwell) - with its bold typography and single watching eye
The Catcher in the Rye (J.D. Salinger) - with its plain red cover and yellow text