Which mathematical product packaging innovation was specifically designed using the golden ratio (approximately 1.618) to subconsciously appeal to consumers while also teaching the concept?

The packaging of mathematical products—from textbooks to calculators, educational games to geometric tools—has evolved significantly over the decades. Clever packaging design in mathematics education products not only protects the items but can enhance understanding of mathematical concepts through visual cues and interactive elements. Test your knowledge about a revolutionary packaging innovation that transformed how students interact with mathematical tools.

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Texas Instruments' graphing calculator packaging from 2015
Fibonacci Blocks' spiral packaging system
Oxford's geometric compass set boxes
Casio's calculator display windows