Which iconic album design, released in 1967, was revolutionary for featuring a real zipper on its physical cover that could be unzipped to reveal images inside?

Product design in the music industry has played a crucial role in creating memorable brand identities and enhancing the customer experience. Album covers, in particular, have become iconic pieces of art that define eras and artists. This trivia tests your knowledge of famous album designs that revolutionized how music products are presented and marketed to consumers. Can you identify this groundbreaking design that changed music packaging forever?

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The Rolling Stones' 'Sticky Fingers' (1971)
The Beatles' 'Sgt. Pepper's Lonely Hearts Club Band' (1967)
Pink Floyd's 'The Dark Side of the Moon' (1973)
The Velvet Underground & Nico's self-titled debut (1967)