An interactive spirograph generator. I originally built this as a C# desktop app in high school after stumbling across a GIF of something similar, and recently ported it to run in the browser.
The math behind how the circles relate to each other is in the ? overlay. Hit the button in the top-left of the sidebar to see the full derivation in LaTeX, or view the original handwritten version.
Built with C# and WinForms on .NET.
Inspired by the benice equation.
