Which mathematical principle is most commonly used in product design for mathematics educational tools to create visually appealing and ergonomic interfaces?

Product design in mathematics education has evolved dramatically over the decades. From basic calculators to advanced learning software, designers have incorporated various mathematical principles to create more intuitive and effective tools. This trivia question focuses on how one particular mathematical concept has influenced the design of educational products and tools across the industry.

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The Golden Ratio (approximately 1:1.618)
The Fibonacci Sequence (1, 1, 2, 3, 5, 8...)
Pascal's Triangle
The Rule of Thirds (1:1:1 proportions)