The Leanfractal is an optimized fractal sound diffuser (acoustic panel). The shape was designed using evolutionary optimization (simulated natural selection) to achieve excellent sound scattering with minimal depth. It also uses fractal self symmetry to achieve high frequency diffusion. Free DIY diffuser plans are available at http://Arqen.com/sound-diffusers/.

Sound diffusers let you treat reflections without absorbing them so you can preserve the liveliness in your room. Diffuser panels can also be arranged to make your room sound physically larger.