Which revolutionary packaging approach for a mathematics learning tool created a 42% increase in retail sales by incorporating what design element directly into its packaging?

In the world of mathematics education products, packaging design goes beyond aesthetics - it often incorporates mathematical concepts, visual cues, and educational elements that enhance the product's appeal and effectiveness. The right packaging can significantly influence purchasing decisions for parents, teachers, and educational institutions. This trivia question explores an interesting intersection between product packaging innovation and mathematical learning tools.

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Geometric unfolding patterns that transform the packaging into usable 3D math manipulatives
Augmented reality markers that display animated math concepts when viewed through a smartphone
Heat-sensitive ink that reveals math formulas and solutions when touched
Packaging made from biodegradable material containing mathematical equations that sprout into plants when planted