A new project I started on involves the curious phenomenon of cymatics. Cymatics consists the analog visualisation of sound through a medium. Mostly solids as salt, rice or sand are used, but also liquids and non-newtonian fluids, like a mixture of cornstarch and water, give awesome effects when exposed to soundwaves.
My idea is to create a self generating cymatic installation, in which the analog effect is captured by video and in realtime translated to a sine wave. It would be best to use the overall luminosity of the video to link directly to the sound generator.
Further more the sand or salt I will be using will be freely exposed to the user so that he can be become a involved fourth factor.
As you can see in the image below this will result in an endless closed loop where all three components influence each other.