Colored waterfigures. Tools used are a homemade hardware controller with an Altera FPGA chip (DE1 terasic board) 2 lasers are used for the detection. Multiple flashes are used. The controller calculate the delay timings, power for the waves on the speaker, camera control and flashes.
Update:
How to make this picture:
Lower part is the membrane on top of a speaker. Before the special waveform is applied a soapbubble is placed above a few colored waterdrops. At this point you have the membrane, color liquids and the soapbubble. The "ball" is a marble that fall and pass through a laserbeam. A photodiode give a signal to the controller to start all the timings needed. The waveform signal is applied after a time and that forms the waterfigures. But at the same time the marble falls into the soapbubble. At this moment its time to fire all the flashes. Ofcource the camera need to be actief at the right time to to have the correct picture. All this correct settings timings and delays give nice figures.
Original here
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