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YouTube / Brusspup

Visual Trickery: Loopy Water, Unmoving Hose

Original image
YouTube / Brusspup

This is nuts. In the two-minute video below, YouTube user Brusspup shows us how a carefully tuned speaker, a tube spitting water, and a camera can create an impressive optical illusion -- the illusion that water flows out of a seemingly unmoving tube in 3D spiral shapes.

So how does this work? It's actually pretty simple to set up: the speaker plays a 24 Hz tone (a very low note), which means 24 cycles of the speaker cone per second. A hose carrying water is attached to the front of the speaker, so it moves in time with the tone (thus, it is waving back and forth 24 times a second). This movement causes the hose to spray water back and forth. Finally, a camera running at 24 fps (frames per second) is pointed at the hose's output. The result is what you see below -- when we synchronize the camera's snapshots of reality and the speaker's movement, we see what looks like an unmoving hose -- the camera happens to snap a frame at moments when the tube is in the same place, so its wild movement is hidden. (Then Brusspup shows us the effects of tuning the speaker at slightly different frequencies -- trippy stuff, and you can now see the tube moving.)

What we're really seeing is a series of snapshots of water that happens to look really neat; the naked eye doesn't see this effect because the eye isn't a video camera (it is not limited to a "24 frames per second" view of the world). This effect is related to the reason that car wheels sometimes "go in reverse" when seen on TV or film: because the frame rate of any camera is limited, the motion of an object being filmed can interact with the camera in interesting ways.

With all that mumbo-jumbo out of the way, just look at this:

If you like that, you'll probably dig Strobe Lights & Water Drops, including a "Time Foundation" -- a technique using a strobe light to make water drops appear to "freeze" in mid-air.

(Via Colossal.)

Google Street View Now Lets You Explore the International Space Station

Google Street View covers some amazing locations (Antarctica, the Grand Canyon, and Stonehenge, to name a few), but it’s taken until now for the tool to venture into the final frontier. As TechCrunch reports, you can now use Street View to explore the inside of the International Space Station.

The scenes, photographed by astronauts living on the ISS, include all 15 modules of the massive satellite. Viewers will be treated to true 360-degree views of the rooms and equipment onboard. Through the windows, you can see Earth from an astronaut's perspective and a SpaceX Dragon craft delivering supplies to the crew.

Because the imagery was captured in zero gravity, it’s easy to lose a sense of your bearings. Get a taste of what ISS residents experience on a daily basis here.

[h/t TechCrunch]

This Is What Flowers Look Like When Photographed With an X-Ray Machine
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Dr. Dain L. Tasker, “Peruvian Daffodil” (1938)

Many plant photographers choose to showcase the vibrant colors and physical details of exotic flora. For his work with flowers, Dr. Dain L. Tasker took a more bare-bones approach. The radiologist’s ghostly floral images were recorded using only an X-ray machine, according to Hyperallergic.

Tasker snapped his pictures of botanical life while he was working at Los Angeles’s Wilshire Hospital in the 1930s. He had minimal experience photographing landscapes and portraits in his spare time, but it wasn’t until he saw an X-ray of an amaryllis, taken by a colleague, that he felt inspired to swap his camera for the medical tool. He took black-and-white radiographs of everything from roses and daffodils to eucalypti and holly berries. The otherworldly artwork was featured in magazines and art shows during Tasker’s lifetime.

Selections from Tasker's body of work have been seen around the world, including as part of the Floral Studies exhibition at the Joseph Bellows Gallery in San Diego in 2016. Prints of his work are also available for purchase from the Stinehour Wemyss Editions and Howard Greenberg Gallery.

Dr. Dain L. Tasker, “Philodendron” (1938)
Dr. Dain L. Tasker, “Philodendron” (1938)

X-ray image of a rose.
Dr. Dain L. Tasker, “A Rose” (1936)

All images courtesy of Joseph Bellows Gallery.


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