Which product design innovation fundamentally transformed the experience of learning geometry in classrooms worldwide during the late 20th century?

Throughout history, mathematical tools have evolved dramatically in both form and function. From ancient counting boards to modern graphing calculators, the design of these products reflects both technological advancement and changing educational approaches. This poll tests your knowledge about a significant design transition in one of mathematics' most ubiquitous learning tools. Consider how product design decisions can fundamentally change user experience and learning outcomes in mathematics education.

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The transition from wooden to plastic rulers with transparent, colored edges that improved visibility of measurement lines
The introduction of dynamic geometry software that allowed students to manipulate shapes interactively rather than using static drawings
The shift from separate compass and protractor tools to integrated multi-function geometry sets with improved ergonomics
The redesign of textbooks to include tear-out geometric templates and 3D pop-up models for hands-on learning