“Cymatics (from Greek: κῦμα “wave”), also known as modal phenomena, is the study of visible sound and vibration, typically on the surface of a plate, diaphragm, or membrane. Directly visualizing vibrations involves using sound to excite media often in the form of particles, pastes, and liquids.”

“Here’s our quick guide to building a Cymatics rig using commonly available parts. We built ours using a combination of over-the-counter and custom-made components.”

Check it out -> http://cymatics.org/