Which groundbreaking publishing innovation, launched in 1935, created a distinctive brand identity through color-coded covers and standardized design, making quality literature more affordable and accessible?

The publishing industry has seen remarkable brand transformations over the decades. Major publishing houses have developed distinct brand identities that signal certain qualities to readers - from Penguin's classic orange spines to modern imprints known for specific genres. This trivia question explores how one iconic literary brand revolutionized reading accessibility and created one of the most recognizable brand identities in literature.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Penguin Books' paperback revolution
Random House's Modern Library series
Barnes & Noble's Classics Collection
Oxford University Press's World's Classics