Which mathematical constant, approximately equal to 1.618, is frequently used in product design and retail visual storytelling to create aesthetically pleasing proportions?

The intersection of mathematics and product design creates some of the most visually appealing and successful retail products in the market. Brands often leverage mathematical principles in their visual storytelling and product design to create aesthetically pleasing experiences that resonate with consumers on a subconscious level. This poll tests your knowledge about how one particular mathematical concept has influenced product design across various successful brands.

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The Golden Ratio (φ)
Euler's Number (e)
The Fibonacci Constant (ψ)
The Retail Proportion Index (RPI)