Which product design innovation did Dieter Rams introduce that revolutionized pocket calculators in the 1970s and later heavily influenced Apple's design philosophy?

Test your knowledge of revolutionary product design that changed entire industries! Product design isn't just about aesthetics—it's about solving problems in ways that can transform how we live. This iconic invention challenged existing paradigms and created an entirely new product category through its innovative approach to user experience. Do you know which groundbreaking design principle was behind this world-changing product?

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The "Less, but better" principle with the ET44 calculator featuring minimal buttons and clean interface
The "Form follows emotion" concept with the first calculator to use color-coded buttons for different functions
The "Design thinking" methodology with the first solar-powered calculator
The "Gestalt theory" application with the first calculator featuring a fully tactile interface with no visual display