Which mathematical concept did Texas Instruments incorporate into their calculator packaging redesign in 2018 that reduced material usage by 15% while maintaining the same protection level?

Product packaging in the mathematics industry has evolved significantly over the decades. From basic cardboard boxes for calculators to sophisticated packaging for advanced graphing tools, companies have used mathematical principles to optimize their packaging designs. This trivia question explores how one famous mathematics tool brand revolutionized their packaging approach using a mathematical concept.

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Golden Ratio proportions
Fibonacci sequence folding patterns
Voronoi tessellation structure
Möbius strip-inspired single-surface design