Which groundbreaking retail innovation did Penguin Books introduce in 1935 that revolutionized the publishing industry and made literature more accessible to the masses?

In the world of publishing, brand identity is crucial for recognition and trust. One of the most iconic publishing houses revolutionized book accessibility with innovative branding and retail strategy in the 1930s, creating a lasting impact on how literature is marketed and consumed. This trivia explores a pivotal moment in publishing history that transformed books from luxury items to affordable cultural necessities through strategic branding and distribution.

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Standardized color-coding system for different genres (orange for fiction, green for crime, etc.)
Affordable paperbacks sold at the price of a pack of cigarettes (sixpence) in non-traditional locations like train stations and department stores
First publisher-owned retail bookstore chain with membership rewards program
Monthly subscription model delivering curated books directly to consumers' homes