Which 1960s album cover design innovation is credited with transforming album packaging from purely functional to an art form that significantly enhanced the customer experience?

When we think about product design in pop culture, album covers represent some of the most influential visual marketing in history. These designs have launched trends, created brand identities for musicians, and sometimes become more famous than the music itself. This trivia question explores a pivotal moment when album cover design fundamentally changed the music retail landscape and consumer experience.

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The Beatles' 'Sgt. Pepper's Lonely Hearts Club Band' with its gatefold sleeve, printed lyrics, and cardboard cutouts
The Rolling Stones' 'Sticky Fingers' with its working zipper on the front cover
The Velvet Underground & Nico's banana cover designed by Andy Warhol
Pink Floyd's 'The Dark Side of the Moon' with its prism spectrum design