Which product design innovation is credited with establishing the concept of 'emotional design' in technology products and introduced the world to translucent colored plastic casings?

Throughout history, certain product designs have become so influential that they've transcended their original function to become cultural icons. These designs often represent breakthrough moments in how we think about the relationship between form and function. This trivia question explores one of the most significant product design innovations that fundamentally changed how we interact with technology.

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The original 1998 Apple iMac G3 with its colorful, translucent shell
The 1979 Sony Walkman with its portable form factor
The 2001 iPod with its revolutionary click wheel interface
The 1977 Atari 2600 with its wood-grain panel design