Interesting to see how Fibonacci squares formula in maths is related to Golden Ratio in Design. Sometimes I use this formula as a hierarchical arrangement in design to set up which subject as my main focus (ex. above: Hive account@orangila facial expression) and supporting elements (ex: above ---> camera ---> body posture)... This formula is a composition guideline theory to lead your eye from supporting elements to your main focus.

Good question. :)