The fibonacci spirals _are_ something special. The simple continued fraction of the golden mean is [1;1,1,...], and its convergents (the sequence of fractions that best approximates it) is ratios of fibonacci numbers. In short, due to the 1,1,1,... nature of the golden mean&#x27;s SCF, it is _the_ number that is hardest to approximate by any rational number. This is why anything that evolves to reduce &quot;periodicity&quot;, they will try to approximate this number, and it is best approximated by ratios of fibonacci.