thinking of vibration as a media that assists sound. What will happen if we get two of these signal at the same time?  Could be an idea for media art.

[youtube=http://www.youtube.com/watch?v=_mgGmrqTf08&NR=1]

[youtube=http://www.youtube.com/watch?v=Ndu5DA-rjbc&feature=related]

[youtube=http://www.youtube.com/watch?v=3zoTKXXNQIU&NR=1&feature=fvwp]