200 dots sit around the circle, numbered 0 to 199. Each dot is joined by a line to the dot with k times its number: with k at 2, dot 7 goes to dot 14, dot 50 to dot 100, and past 199 the count wraps around to 0 again.
The source code is at github.com/KirillOsenkov/LiveGeometry. It is written in .NET and Avalonia.