[MSL]

Visible sound

  We can hear the sounds. But can we see them? Yes, there is a way to make a sound "visible". Learn more about it: http://en.wikipedia.org/wiki/Cymatics. Cymatics is a very interesting study, isn't it...
 I watched today some examples of this. The figures were very interesting.

[SEO]

A good video about the visual sound: http://www.ted.com/talks/evan_grant_cymatics.html

[Incel]

Good one.