Which mathematically-inspired product innovation of the 1970s was initially dismissed as a teaching tool but became a global phenomenon selling over 450 million units?

Mathematics has profoundly influenced product innovation, especially in geometric designs that blend form and function. In the 1970s, one particular mathematical concept revolutionized how certain educational products were designed, manufactured, and marketed worldwide. This mathematical innovation created an entire category of products that remain popular today. Test your knowledge about this intersection of mathematics and product design history!

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Rubik's Cube, created by Hungarian architect and professor Ernő Rubik as a 3D geometric teaching model
Texas Instruments TI-30 calculator, which brought complex mathematical functions to students through affordable integrated circuits
Spirograph, based on mathematical roulette curves that allowed users to create intricate geometric patterns
Zometool, the geometric construction system based on projections of higher-dimensional polytopes