Harmonic

After clicking on a Squiggle, we can change the background color by clicking the space bar. A harmonic is a ribbed where the rib color matches one of the preset background colors (those are: 0, 25, 50, 75, 100, 125, 150, 175, 200, 225, and 255). Harmonics look beautiful when the rib is merged (and dissappears) with the background.