This is 99% invisible, I'm Roman Mars.
The five basic principles of flag design
The five basic principles of flag design according to the North American Vexillological (Vex-illo-logical. It's the extra 'lol' that makes it sound weird) Association. Vexillology is the study of flags.
Number one: Keep it simple.
The flag should be so simple that a child can draw it from memory. Before I moved to Chicago, in 2005, I didn't even know cities had their own flags. "Most larger cities have flags." That's Ted K., flag expert, totally awesome guy. "I'm the editor of a scholarly journal on flags called 'Raven: A Journal of Vexillology.'" And that first city flag I discovered in Chicago is a beaut: a white field, two light blue horizontal stripes, and four six-pointed red stars across the middle.
Number two: Use meaningful symbolism.
The blue stripes represent the water, the lake, and the rivers. The red stars represent significant events in Chicago's history.