Gravity is a force that is unconquerable to man, at least for men (and women) that don’t rig up their subwoofers and video cameras for this incredible trick.
As the video below shows, a subwoofer producing a 24Hz sine can be used to create a very cool optical illusion, with the water caught ‘frozen’ or running backwards simply by varying the frame rate on the camera.
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YouTube user ‘Brusspup’, who shot and published the video, explains more:
Basically your cameras frame rate is synced up with the rate of the vibrations of the water so it appears to be frozen or still. Now if you play a 23 hz sine wave your frame rate will be off just a little compared to the sine wave causing the water to “move backward” or so as it appears. You can play a 25 hz sine wave and cause the water to move slowly foward.
Hat tip Jon Randy on Google+