Amazing water and sound experiments.......Remember that the camera has a specific frame rate, in this case close to 24hz. In reality this water looks like a fanned spray. The hose is flexing back and forth and the camera is always capturing it at the same time so it ‘freezes’ in shape. If the speaker is slightly faster then the camera the water appears to flow in reverse but really the water is flowing forward at 98% of the camera speed. Think movies of tires or helicopter blades that freeze or move backwards. sean14powell

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