The golden ratio is the most irrational number Richard A. Dunlap, The Golden Ratio and Fibonacci Numbers
Use the famous Fibonacci sequence to naturally size and weight ranges for your SASS stylesheets.
On modern webpages plenty of things need scaling incrementally. Font sizes increase; spaces decrease on smaller screens; feature boxs shrink with quantity.
SassyFibonacciness makes use of nature's natural scale to provide values you can use for CSS size properties. One of the principals of the elioWay is a "you handle this for me" attitude... inviting developers to surrender minute control in the pursuit of simplicity.