Which mathematical product design innovation from the 1960s revolutionized education by allowing students to visualize abstract concepts and is still influencing modern educational technology?

Before modern calculators and computers transformed mathematical education and research, specialized tools and instruments were essential for both learning and practical applications. These tools not only shaped how mathematics was taught but also influenced product design principles that we still see today. Test your knowledge about the evolution of mathematical teaching aids and their impact on product design!

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The Cuisenaire rods (colored mathematical learning aids)
The Curta mechanical calculator
The Slide Rule Watch
The Brunsviga mechanical calculator