Even though I loved math in school, I was just like most of my friends in believing that high school algebra and geometry would prove useless in real life. "When am I ever gonna use this?!" Well, I have used it so many times! Just the design potential alone should have made me, the wannabe artist, a champion for geometry. Here is my homage to Fibonacci and the fascinating golden spiral. I call my umbrella design "Geometry for a Rainy Day."