Which innovative packaging design for a mathematics teaching tool included built-in measurement grids that doubled as classroom demonstration aids?

Educational mathematics tools have evolved dramatically over the decades, with companies constantly innovating to make abstract concepts more tangible. This poll explores a fascinating case of product packaging innovation that revolutionized how a specific math tool was marketed and distributed to schools. The packaging solution mentioned became a case study in educational product design, combining practicality with mathematical principles.

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Texas Instruments' 'Unfolding Classroom' graphing calculator cases that transform into coordinate plane demonstration boards
Staedtler's 'Geometric Origami' compass sets with packaging that converts to 3D shape templates
Maped's 'Math Matrix' protractor packaging with fold-out angle reference guides and degree markers
Faber-Castell's 'Calculation Station' ruler sets housed in cases that expand into fraction and decimal conversion tables