Here’s a fun experiment to fool your eyes. Well, you can’t exactly see it with your naked eye but it’s relatively simple to do. Do you want to capture videos such as the one on the screen shot above? All you need is a camera with 24fps setting, water and a soft rubber water hose, a computer with tone generating software, a speaker and duct tape to patch it all up. Here’s how you do it…
According to YouTube user brusspup who uploaded the video, here’s what you do:
“Run the rubber hose down past the speaker so that the hose touches the speaker. Leave about 1 or 2 inches of the hose hanging past the bottom of the speaker. Secure the hose to the speaker with tape or whatever works best for you. The goal is to make sure the hose is touching the actual speaker so that when the speaker produces sound (vibrates) it will vibrate the hose.
Set up your camera and switch it to 24 fps. The higher the shutter speed the better the results. But also keep in the mind that the higher your shutter speed, the more light you need. Run an audio cable from your computer to the speaker. Set your tone generating software to 24hz and hit play. Turn on the water. Now look through the camera and watch the magic begin. If you want the water to look like it’s moving backward set the frequency to 23hz. If you want to look like it’s moving forward in slow motion set it to 25hz.”