Which mathematical psychology principle did the education company Desmos leverage in their brand storytelling to achieve massive growth in the classroom graphing calculator market?

Behind every successful mathematics product lies careful psychological research and marketing strategy. Educational tool companies invest heavily in understanding how students and educators interact with their products, often applying mathematical principles to their own marketing efforts. This poll tests your knowledge of the intersection between mathematics education products and consumer psychology.

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The Golden Ratio (1.618...) for visual appeal in their user interface design
Zipf's Law to optimize their search algorithm functionality
The Weber-Fechner Law to determine optimal pricing strategy
Benford's Law to create their distinctive logo pattern