Sound diffusion simulation. A sound wave scatters as it hits a jagged surface (finite difference time domain simulation).
This simulation is just a fun experiment. It's part of a larger project, where I designed acoustic diffusers using 'evolutionary optimization' (simulated natural selection). The optimized designs look less crazy than what you see here. Check out Arqen.com/acoustics/ for simple DIY diffuser designs, which you're free to build. You can also download my thesis for free -- if you want geeky details!