Which music industry innovation did Peter Saville pioneer for Joy Division's 'Unknown Pleasures' album packaging in 1979?

Album artwork has been an integral part of music marketing since the vinyl era, often becoming as iconic as the music itself. From The Beatles' 'Sgt. Pepper' to Pink Floyd's 'Dark Side of the Moon,' album covers serve as powerful product packaging that shapes our perception of the music and creates lasting cultural impact. Test your knowledge about the intersection of visual art and music marketing with this challenging question about a groundbreaking album packaging innovation.

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First use of pulsar radio wave imagery on an album cover, creating an iconic scientific visualization in music packaging
First album cover with a built-in holographic image that changed when viewed from different angles
First album packaging to include detachable postcards featuring band photographs
First album cover printed with heat-sensitive ink that revealed hidden artwork when touched