This is a "not good for anything really" video that tries to represent the acoustic wave-front reflected off varios diffusers versus a flat plane. Not taking the video very seriously, schroeder diffusers seem to no differ too much between having or not having well walls, but they do differ slightly. The 2d modulated version of the diffuser looks a lot cooler. The frequency response and polar patterns (which are very important) are not evident at all when looking at these videos.
