Which product design innovation is credited with popularizing the concept of 'form follows function' in consumer electronics and featured a revolutionary click wheel interface?

Throughout history, certain product designs have revolutionized industries and changed how we interact with technology. These iconic designs often emerged from solving specific problems in innovative ways, creating new product categories or redefining existing ones. This trivia question focuses on a pivotal moment in product design history that transformed consumer electronics and set new standards for industrial design principles.

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Apple iPod (2001)
Sony Walkman (1979)
Motorola StarTAC (1996)
Palm Pilot (1997)