Which innovative book packaging design approach did Penguin Books pioneer in 1935 that revolutionized the publishing industry?

Book cover design has evolved dramatically over centuries, from simple leather-bound protections to strategic marketing tools. In today's competitive publishing landscape, packaging design plays a crucial role in a book's commercial success. The visual elements, typography, and physical features of a book can influence consumer perception and purchase decisions. Test your knowledge about this fascinating intersection of literary art and product design!

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Color-coded book spines organized by genre (orange for fiction, green for crime, etc.)
Hardcover books with removable dust jackets that doubled as promotional posters
Transparent plastic slip covers showing partial glimpses of the first page
Scented paper treatments matched to book themes (e.g., ocean scent for maritime novels)