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    Incredible optical illusion



    The setup in the video is simple. A supply of water is atop a subwoofer and allowed to leak slowly down past the front of the speaker. The subwoofer is used to output tones of 23 and 24Hz, which produces an astounding effect. These tones cause the water to appear to be frozen in mid air, or even to flow backwards in the video.

    Watch yourself…

    The secret is that the camera used to film the effect has a frame rate matching that of the tone. When set to 24 frames per second, the video frame rate is synced with that of the oscillation of the water drops if the subwoofer is outputting 24Hz. That makes the water drops look like they are suspended in mid-air. If the tone is dropped to 23Hz, the video is slightly out of sync, and the water appears to flow up into the spout. Brussup’s video description also states that a 25Hz signal will make water appear to flow downward in slow motion.

    Posted by Blobber - Sep 12, 07:52 PM
    Posted in Curiosities

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