Which mathematical principle, approximately equal to 1.618, is frequently used in product design to create visually appealing proportions that have been proven to increase retail sales?

The mathematics of product design can significantly impact consumer perception and retail success. One mathematical concept has been particularly influential in creating visually appealing products and packaging that consumers instinctively find attractive. This concept has been employed by major brands from Apple to Mercedes-Benz in their product designs, logos, and retail spaces. Can you identify this mathematical principle that has become a cornerstone of aesthetic product design?

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The Golden Ratio (Phi)
The Fibonacci Sequence
The Rule of Thirds
The Pythagorean Theorem