Matthew Consterdine's

Despite their simplicity, a spirograph can create complex and visually appealing shapes. Originally designed to help prevent banknote forgeries, the spirograph is now a children’s toy sold worldwide.

Using simple mathematical equations I’ve created a simulation that creates many random Spirographs. Behind the scenes each Spirograph is rendered to a canvas buffer which is then drawn to the main canvas for performance. Why not play, the code is on GitHub.

Click or use +/-/C to create or remove spirographs. Scroll to speed up or slow down time. Press space to play or pause the simulation. Press T to toggle trails.