What do sound waves look like?

UCSC OpenLab Mechatronics group: Zach Corse, Adam Fischer, David Harris, Andre Marquetti, Sean Pace, and Steven Trimmer created a water tank to translates the auditory into the visual by way of vibration. 

As low frequencies match the intrinsic harmonics of the tank, they excite the dancing localized waves on the surface. Different frequencies excite different patterns in the reflective pool.