Self-described as “an inventory of cross-disciplinary interestingness, spanning art, science, design, history, philosophy, and more,” Maria Popova’s Brain Pickings explores many different genres and ideas with multiple sources that can help you find something to be inspired by. Typically their posts will start with a quote, or a literary thought experiment, and dive deep into the stories or moments that inspired them.
The complicated squiggles you see in real-world string vibrations are the mathematical sum of all these different harmonics. Each harmonic produces a different pitch, so when you play a note, you’re actually hearing many different pitches at once. It’s possible to isolate the different harmonics of a string and hear their individual pitches. Harmonics are very useful for tuning your guitar. They are also the basis of the whole Western tuning system generally.