Movie whose pattern varies in real time with frequency vibration of sound

I use salt rather than white sand. It is easy and good. High-frequency sound until the point is horrible. A sound wave weapon level where complaints come from a neighbor surely when playing a movie with a large volume. Let's pay attention to playback again.
Zipped.org - Best of the web all in one place (WMV format)

GoogleVideo version

Also here is a movie about what happens when doing the same thing with water drops like this.
http://perso.wanadoo.fr/firefly/eau/

It is quite amusing as the monon moves.

Various patterns of finished patterns
http://www.world-mysteries.com/sci_cymatics.htm

As a logical reason, vibrating places and vibrating places appear regularly, and sand etc. gather at nodes, so vibration is observed as a sand pattern.

For more detailed reasons see below.

Human force search Hatena - When sand is uniformly sown on a brass disk, giving a vibration of an intrinsic frequency on the disk, a geometric pattern is formed. There are two patterns in that pattern, but that ..
http://q.hatena.ne.jp/1119249203