Which innovative album packaging technique did Radiohead pioneer with their 2007 'In Rainbows' release that revolutionized physical music distribution?

The music industry has always pushed boundaries in how physical albums are packaged and presented to fans. From vinyl sleeves to digital innovations, packaging has been both functional and artistic. This trivia question tests your knowledge about a groundbreaking packaging innovation that changed how fans experienced music physically. Think about memorable album releases where the packaging itself became part of the artistic statement!

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The 'discbox' - a premium package containing vinyl, CD, artwork and digital downloads in recycled materials with no plastic
The first major 'augmented reality' album cover that revealed hidden content when viewed through a smartphone app
A biodegradable seed-embedded album cover that could be planted after purchase to grow wildflowers
The 'infinity box' with mirrors creating an endless visual effect when opened, representing the album's themes