The Simple Optical Illusion That Makes an Image Look Like It's Drawing Itself

iStock
iStock

Artist James Nolan Gandy invents robot arms that sketch intricate mathematical shapes with pen and paper. When viewed in real time, the effect is impressive. But it becomes even more so when the videos are sped up in a timelapse. If you look closely in the video below, the illustration appears to materialize faster than the robot can put the design to paper. Gizmodo recently explained how the illusion works to make it look like parts of the sketch are forming before the machine has time to draw them.

The optical illusion isn’t an example of tricky image editing: It’s the result of something called the wagon wheel effect. You can observe this in a car wheel accelerating down the highway or in propeller blades lifting up a helicopter. If an object makes enough rotations per second, it can appear to slow down, move backwards, or even stand still.

This is especially apparent on film. Every “moving image” we see on a screen is an illusion caused by the brain filling in the gaps between a sequence of still images. In the case of the timelapse video below, the camera captured the right amount of images, in the right order, to depict the pen as moving more slowly than it did in real life. But unlike the pen, the drawing formed throughout the video isn't subject to the wagon-wheel effect, so it still appears to move at full speed. This difference makes it look like the sketch is drawing itself, no pen required.

Gandy frequently shares behind-the-scenes videos of his mechanical art on his Instagram page. You can check out some of his non-timelapse clips like the one below to better understand how his machines work, then visit his website to browse and purchase the art made by his 'bots.

And if you think his stuff is impressive, make sure to explore some of the incredible art robots have made in the past.

[h/t Gizmodo]

Bob Dylan's Lyrics, Poetry, and Prose Showcased at Chicago's American Writers Museum

A collection of Bob Dylan poems that was auctioned off by Christie's in 2005.
A collection of Bob Dylan poems that was auctioned off by Christie's in 2005.
Stephen Chernin, Getty Images

Like a Rolling Stone, Tangled Up in Blue, Blowin’ in the Wind, and The Times They Are a-Changin’ are among Bob Dylan’s best songs, but the 77-year-old singer’s writing isn’t limited to lyrics. Dylan has also penned poems, prose, an autobiography, and a nearly four-hour movie (that got terrible reviews).

An ongoing showcase at Chicago’s American Writers Museum is paying homage to Dylan the writer. The "Bob Dylan: Electric" exhibit, which will remain on view though April 30, 2019, highlights dozens of items from Dylan’s expansive career.

“The world knows Bob Dylan as a prolific songwriter,” museum president Carey Cranston said in a statement. “'Bob Dylan: Electric’ gives the public a chance to see how his writing shaped more than just American music, but American literature as a whole.”

The period covers Dylan’s “electric” career, beginning with the time he made his electric guitar debut at the 1965 Newport Folk Festival. The exact instrument he played at the festival—a 1964 sunburst Fender Stratocaster—is naturally one of the items on display.

Visitors can also check out Dylan’s personal copy of The Catcher in the Rye, which he read in the summer of 1961. He jotted down notes and drew doodles in the back of the book, including a bottle of rye and the words “good book.” (Interestingly enough, a talent agent approached Dylan the following year and asked if he’d play Holden Caulfield in a movie adaptation of the book. For better or worse, that never came to fruition.)

Dylan’s writing was recognized with a Nobel Prize in Literature in 2016. At the time, the committee's decision to award a songwriter rather than a novelist was a controversial one. The New York Times dubbed it a “disappointing choice,” while Scottish novelist Irvine Welsh (author of Trainspotting) was a little more blunt, calling it “an ill-conceived nostalgia award wrenched from the rancid prostates of senile, gibbering hippies.”

Nonetheless, Dylan accepted the award, eventually releasing a video detailing his literary influences. Moby-Dick, All Quiet on the Western Front, and The Odyssey are just a few of the singer-songwriter’s many inspirations.

Vinnie Ream: The Teen Who Met With Abraham Lincoln for 30 Minutes Every Day

Library of Congress // Public Domain, Wikimedia Commons
Library of Congress // Public Domain, Wikimedia Commons

Some of the most important people in the world have trouble getting even a few minutes of the president’s time. But in 1864, 17-year-old Lavinia “Vinnie” Ream managed to steal half an hour with Abraham Lincoln every day—for five months.

Ream made a name for herself as an artist at a young age. Word of the teen prodigy’s painting prowess quickly spread, and in 1863, Missouri Congressman James Rollins introduced her to sculptor Clark Mills. Through Mills, Ream discovered her talents included molding clay.

After creating small, medallion-sized likenesses of General Custer and many Congressmen, including Thaddeus Stevens, several senators commissioned Ream to create a marble bust—and this was just over a year after she had picked up the skill. The senators allowed Ream to choose her subject, and she picked the president—Abraham Lincoln.

Ream's friends in the Senate personally asked Lincoln to pose for the sculpture, but he declined. After hearing that she was a struggling artist from a Midwestern background not dissimilar to his own, however, Lincoln relented. “He granted me sittings for no other reason than that I was in need,” she later wrote. “Had I been the greatest sculptor in the world I am quite sure I would have been refused.”

Not only did the president agree to the sitting, he gave her a half-hour of his time every day for five months—no small sum of time for a man in such demand. “It seemed that he used this half-hour as a time for relaxation, for he always left instructions that no one was to be admitted during that time,” Ream said. “He seemed to find a strange sort of companionship in being with me, although we talked but little.” He occasionally talked about his son Willie, who had died two years before. The stories sometimes moved him to tears, and he told Vinnie that she reminded him of Willie. Lincoln "never told a funny story to me. He rarely smiled," Ream later recalled.

After Lincoln's fateful night at Ford's Theatre, Congress hired Ream to create a memorial statue of the fallen president, making her the youngest artist—and the first woman—to receive a commission from the U.S. government.

Though she had already proved that she could create a remarkable likeness of Lincoln in bust form, not everyone on the commission was convinced she would be up to the task of sculpting a full-length version. “Having in view the youth and inexperience of Miss Ream, and I will go further, and say, having in view her sex, I shall expect a complete failure in the execution of this work,” Senator Jacob Merritt Howard said.

But Ream had the last laugh: Her work still graces the Capitol Rotunda today.

Vinnie Ream's sculpture of Abraham Lincoln still stands in the Capital Rotunda
USCapitol via Flickr // Public Domain, Wikimedia Commons

This article originally ran in 2016.

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