Draw something, and this program will then recreate that drawing using only circles! Recommended to use Turbowarp: https://turbowarp.org/1170559020, or hold space then click green flag to skip drawing the circles, which will make it faster. This uses something called the Discrete Fourier Transform, which can turn any list of data into sine waves that when added up, recreate the original! With some more maths, you can turn these sine waves into circles, to draw a 2D shape.
Thanks to The Coding Train for the idea.