What's the Golden Rule and how does it apply to real life? That's how I started down this road and ended up at the Golden Ratio.
Turns out the Rule is "Do unto others as you would have them do unto you." A classic quote and philosophy found in almost every religion.
The Ratio, described in the picture above, appears geometrically in nature, music, architecture, art, and places you don't expect, like your face. It throws you for a curve just thinking about it, but look at any straight edge in front of you (a coffee table perhaps?) and start breaking it down with your hands the way the picture describes.
The idea has been around for centuries! Fascinating stuff.