Cymatics is the study of the physical effects of sound waves. Some have used this idea of the "shapes of sound" in interesting ways. For example, some feel this knowledge can be used to explain such things as psychosomatic illness and promote audio therapy. Thomas J. Mitchell has used the mysterious shapes found at Rosslyn Chapel (mentioned in Dan Brown's Best Seller "The Da Vinci Code") to create music:
Mitchell has used this music "code" as pseudo-supernatural sheet music to produce a CD, entitled the Rosslyn Motet. I have yet to hear the CD, but when I do, I will follow up.
The theories of cymatics are described HERE. The following video gives a better demonstration of the theory than the previous video: