In 1935, which groundbreaking design element did Penguin Books introduce that revolutionized book marketing and made literature more accessible to average readers?

In the world of publishing, brand identity can dramatically influence how readers perceive books. Penguin Books revolutionized the publishing industry with its innovative approach to design and marketing, making literature more accessible to the masses. This trivia question explores a pivotal moment in publishing history when corporate branding transformed how we interact with literature. Test your knowledge of this iconic publisher's brand evolution!

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Standardized color-coded covers (orange for fiction, blue for non-fiction, etc.) with uniform typography and the penguin logo
First-ever digital watermarks allowing books to be tracked through distribution
Celebrity author photographs on all book covers to create personal connection
Interactive fold-out maps and illustrations embedded within fiction titles