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A year or two ago when I was doing some research on sound exhibits I ran across a place that had different shaped metal plates that visitors would place sand on top and "play" with a bow.  I believe this would show vibration patterns in the sand.  Does anyone know what I am talking about and where I might get some information on building an exhibit like this?

Thank You
Chad Johnson
Experiential Educator
The Edgerton Explorit Center
http://www.edgerton.org
1.877.694.4032

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