Which innovative vinyl packaging design feature contributed most significantly to the 2020-2022 surge in collector's edition sales?

The resurgence of vinyl records has been one of the most fascinating trends in the music industry over the past decade. Despite digital streaming dominating music consumption, physical vinyl sales have experienced remarkable growth. This renaissance has brought innovative packaging design back into focus, with artists and labels using album covers, inserts, and special editions as crucial marketing tools and artistic expressions. How well do you know the strategies behind modern vinyl packaging design?

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Holographic album covers that create 3D visual effects without special glasses
Scratch-and-sniff elements that release scents related to the album's theme
Color-changing vinyl that responds to temperature variations during playback
Augmented reality inserts that display animated content when viewed through smartphone apps