This clever optical illusion uses sound frequency and a digital camera to “freeze” water in time and space.
YouTube user MrBibio explains the hack:
Creating the illusion of a static flow of water using sound. Of course this isn’t my idea and plenty more refined examples already exist.
I tried this same experiment years ago but using a strobe light, but it’s harsh on the eyes after a while and hard to video successfully. It only dawned on me shortly before making this that for video purposes, no strobe light is required. This is because the frame rate and shutter of the camera is doing a similar job to the strobe.
The speaker-as-frequency-generator model is definitely easier on the eyes than similar experiments that rely on high-speed strobes.
[via Geeks Are Sexy]