Which famous mathematics education product was first packaged in a distinctive blue plastic case with yellow pieces, and introduced the concept of 'hands-on geometry' to millions of students worldwide?

Product packaging in mathematics education has evolved significantly over the decades. From simple chalk and blackboards to sophisticated digital tools and manipulatives, the way mathematical concepts are 'packaged' for learners has transformed the educational landscape. This trivia question focuses on an innovative mathematical product packaging approach that revolutionized how students interact with geometric concepts.

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Geometer's Sketchpad software
Cuisenaire rods
Geometric Constructor Set
Zometool geometric modeling system