Which mathematical product design innovation, released in 1981, was praised for transforming spatial reasoning and was based on the principles of projective geometry?

The design of educational mathematics tools has evolved significantly over the decades. Certain products have revolutionized how students visualize and interact with mathematical concepts. This poll tests your knowledge of a groundbreaking product that transformed geometry education through innovative design principles.

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Geometer's Sketchpad software
The Rubik's Cube
Texas Instruments graphing calculator
Zometool geometric construction set