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Author Topic: Enormously cool optical illusion - Happy Friday!  (Read 2345 times)
perkiset
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« on: April 20, 2012, 11:02:54 AM »

Brilliant juxtaposition of sine wave effects to dripping water and the shutter speed of a camera.

Confused? Check out how they make water freeze in mid air, and then actually flow back up into the faucet in real time:

http://www.popsci.com/science/article/2012-04/video-freezing-stream-water-mid-air-or-moving-it-backwards

One of the best optical illusions I've seen in a long time.

Happy Friday everyone!
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Bompa
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« Reply #1 on: April 20, 2012, 05:19:47 PM »

Weird that they can use sound to create that effect.

I am still trying to figure out why the spokes on a car's wheel
seem to be spinning backwards sometimes.

duh
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perkiset
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« Reply #2 on: April 20, 2012, 06:51:37 PM »

I assume you're kidding, because it's the same thing - its about the shutter speed of the camera.

The speaker is pumping out a sine wave that vibrates the water at (that) hertz, then the camera, shooting at the same hertz, only "sees" the droplets in a particular position because of the physics of how long it takes for water to drop.

Really cool.
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« Reply #3 on: April 20, 2012, 07:45:04 PM »

I was not kidding at all when I said it's odd they use audio to create the effect.

Yes, it's about the shutter speed, but usually, the shutter speed is matched
up with light, not audio. Cameras see light, not sound.

The speaker vibrates the water?  So, a stream of water will vibrate at
the same frequency of the nearest sound?

So, on a rainy day, a we hear a train whistle, we know the tone of the
whistle so we whip out our camera and set the shutter speed. Aim
towards the train and all the rain drops will appear to stop in mid air.
Alter the shutter speed and the rain drops will go back up into the clouds.

LOL


I call hoax again.

Cheesy

Bompa
« Last Edit: April 20, 2012, 07:58:03 PM by Bompa » Logged

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perkiset
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« Reply #4 on: April 20, 2012, 10:51:02 PM »

I think it's about the speaker vibrating at the mouth of the nozzle. So the water flows, but surface tension and vibration the causes it to "pulse" on the way out, which in conjunction with with shutter speed causes the illusion.
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