Which mathematical concept has become increasingly popular in the packaging design of mathematics education products, often featured explicitly on textbook covers and geometry tool sets?

In the world of mathematics education products, packaging design isn't just about aesthetics—it's about embodying mathematical principles. One particular mathematical concept has revolutionized how textbooks, geometric tools, and educational mathematics software are packaged and marketed. This principle creates visually appealing proportions that many believe are inherently pleasing to the human eye, and has become a significant trend in mathematics product packaging over the past decade.

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The Golden Ratio (approximately 1.618)
Pascal's Triangle
The Fibonacci Sequence
The Mandelbrot Set