Geometry is an amazing part of math knowledge. When I was in school and someone would say, “Why should I learn this, I’ll never use it,” it astonished me. All around us are amazing geometries that are not only meaningful, but give life structure. and beauty.
Phi is a number–.1.6180339. It’s called the Golden Ratio. Like Pi, it continues forever. There is a way it was derived, and if you are super geeky, you will recognize this definition from Wikipedia: “In mathematics and the arts, two quantities are in the golden ratio if the ratio of the sum of the quantities to the larger quantity is equal to the ratio of the larger quantity to the smaller one.” (I just heard half my daily readers leaving.)
There is something even more interesting about Phi. The number can be scaled into a grid. And the grid gains meaning in nature–it can be found in the way rose petals shape the bud, the pattern of sunflower seeds in the center of the flower, and the way branches are spaced along the trunk of a tree.
Even if you’ve never heard of Phi, you are walking around with it. The length of your hands and lower arms follow Phi, and so do your facial features. Leonardo Da Vinci figured out many of the applications.
Here’s a quick way to check: your foot is the length of your lower arm. If you are flexible enough, place your heel on the inside of your elbow. Your toes will reach to your wrist.
Shells that spiral follow the path of Phi. The eye, fin and tail of a dolphin align with the ratio. A line drawn between the pupils and down to the corners of the mouth follow the Phi proportion. We consider a person attractive if the lines form a square. Your two front teeth form a rectangle in the Phi proportions in height and width.
—Quinn McDonald suffers from some forms of math fear, but loves geometry. She is a writer and creativity coach.