What does sound look like? Visualizing the dispersion of sound waves has always fascinated me. Compression and rarefaction of air molecules create the sensation of hearing all around us, yet it is invisible to the human eye. Cymatics, or a way of visualizing sound through matter (i.e. sand or water) allows another glimpse into the complex dispersion characteristics of sound pressure and frequency.
A recent installation at the Olympus Photography Playground in Berlin uses a speaker with a bottle cap of water resting on top. By using special lighting, a clear visualization of the water patterns (created by Synthesizers which in turn create sound transmission/vibrations on the speaker cone) can be witnessed. Watch this video below for an example of this interactive exhibit.
For more information on Sonic Water visit the Laboratory for Water Sound Images.