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The Dynamics of Colour: Aristarkh Lentulov

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Aristarkh Lentulov (1882-1943) is yet another artist whose work is fascinating and influential, yet about whom very little information is available. His work, however, is too amazing to go without mention in "Feel Art Again," so I've scrounged up what information I can about Lentulov and his 1913 painting "Vasily the Blessed Cathedral."

1. Although Aristarkh Lentulov was not born into a rich or artistic family, he was still able to receive 8 years of art schooling, after which he studied in the private studio of Dmitry Kardovsky in St. Petersburg. He became very active in the art scene, co-founding the Jack of Diamonds group, a group of exhibiting avant-garde artists, and serving as chairman of the Society of Moscow Artists. Among those he influenced were Vassily Kandinsky and Kazimir Malevich, whose fame seems to have surpassed Lentulov's.

2. While studying in Paris from 1911 to 1912, Lentulov hung out with the Cubo-Futurists, who referred to him as a "futurist à la russe."

3. In "Vasily the Blessed Cathedral," Lentulov tried to portray "every part of the cathedral at the same time." His daughter wrote that "He went around the cathedral dozens of times trying to remember its strange angles"¦in order to make it a boundless fantasy worthy of fairy tales in terms of shapes and colours." He called the principle he worked on the "dynamics of colour."

4. The cathedral depicted is the Cathedral of the Intercession of the Virgin of the Moat, which is located on the Red Square next to the Kremlin. The cathedral is often mistaken for the Kremlin, or at least part of it, in the West, but the two buildings are separate and unassociated (other than their geographic proximity).

5. Commissioned by Ivan IV (a.k.a. "Ivan the Terrible"), the cathedral consists of 9 chapels on one foundation. The original concept was to build a cluster of chapels, each one dedicated to one of the saints on whose feast days the tsar had won battles. Since the tsar's victory against the Tartar Mongols came on the feast of the Intercession of the Virgin, the whole cathedral was named in her honor. It became referred to as St. Basil's, after the "holy fool" Basil the Blessed, who was quite popular at the time (1555-1561).

6. Several legends surround the iconic cathedral. One tale involves Ivan blinding the cathedral's architect, Postnik Yakovlev, to prevent him from building an even more magnificent building for anyone else. The tale has been debunked, though, since Yakovlev designed an addition to the building in 1588, after Ivan's death. Another story involves Napoleon, who was supposedly so impressed with the cathedral that he wanted to bring it back to France. Lacking the ability, he ordered the building destroyed during the French retreat from the city. Kegs of gunpowder were set up and their fuses lit but, thanks to a "sudden, miraculous shower," the fuses were extinguished, the explosion prevented, and the cathedral saved.

A larger version of "Vasily the Blessed Cathedral" is available here.

Fans should check out the Wikimedia commons gallery of Aristarkh Lentulov paintings.

Current Exhibitions featuring "Feel Art Again" artists:
Georgia O'Keeffe and the Camera (Portland, ME: through September 7, 2008)
Frida Kahlo (San Francisco: June 14 - Sept. 28, 2008)
The Glass Experience, feat. Dale Chihuly (Chicago: through Sept. 1, 2008)
Picasso: Abu Dhabi (Abu Dhabi, UAE: through Sept. 4, 2008)

"Feel Art Again" appears every Tuesday, Thursday, and Saturday. E-mail us at feelartagain@gmail.com with details of current art exhibitions or suggestions of artists.

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iStock // Ekaterina Minaeva
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Man Buys Two Metric Tons of LEGO Bricks; Sorts Them Via Machine Learning
May 21, 2017
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iStock // Ekaterina Minaeva

Jacques Mattheij made a small, but awesome, mistake. He went on eBay one evening and bid on a bunch of bulk LEGO brick auctions, then went to sleep. Upon waking, he discovered that he was the high bidder on many, and was now the proud owner of two tons of LEGO bricks. (This is about 4400 pounds.) He wrote, "[L]esson 1: if you win almost all bids you are bidding too high."

Mattheij had noticed that bulk, unsorted bricks sell for something like €10/kilogram, whereas sets are roughly €40/kg and rare parts go for up to €100/kg. Much of the value of the bricks is in their sorting. If he could reduce the entropy of these bins of unsorted bricks, he could make a tidy profit. While many people do this work by hand, the problem is enormous—just the kind of challenge for a computer. Mattheij writes:

There are 38000+ shapes and there are 100+ possible shades of color (you can roughly tell how old someone is by asking them what lego colors they remember from their youth).

In the following months, Mattheij built a proof-of-concept sorting system using, of course, LEGO. He broke the problem down into a series of sub-problems (including "feeding LEGO reliably from a hopper is surprisingly hard," one of those facts of nature that will stymie even the best system design). After tinkering with the prototype at length, he expanded the system to a surprisingly complex system of conveyer belts (powered by a home treadmill), various pieces of cabinetry, and "copious quantities of crazy glue."

Here's a video showing the current system running at low speed:

The key part of the system was running the bricks past a camera paired with a computer running a neural net-based image classifier. That allows the computer (when sufficiently trained on brick images) to recognize bricks and thus categorize them by color, shape, or other parameters. Remember that as bricks pass by, they can be in any orientation, can be dirty, can even be stuck to other pieces. So having a flexible software system is key to recognizing—in a fraction of a second—what a given brick is, in order to sort it out. When a match is found, a jet of compressed air pops the piece off the conveyer belt and into a waiting bin.

After much experimentation, Mattheij rewrote the software (several times in fact) to accomplish a variety of basic tasks. At its core, the system takes images from a webcam and feeds them to a neural network to do the classification. Of course, the neural net needs to be "trained" by showing it lots of images, and telling it what those images represent. Mattheij's breakthrough was allowing the machine to effectively train itself, with guidance: Running pieces through allows the system to take its own photos, make a guess, and build on that guess. As long as Mattheij corrects the incorrect guesses, he ends up with a decent (and self-reinforcing) corpus of training data. As the machine continues running, it can rack up more training, allowing it to recognize a broad variety of pieces on the fly.

Here's another video, focusing on how the pieces move on conveyer belts (running at slow speed so puny humans can follow). You can also see the air jets in action:

In an email interview, Mattheij told Mental Floss that the system currently sorts LEGO bricks into more than 50 categories. It can also be run in a color-sorting mode to bin the parts across 12 color groups. (Thus at present you'd likely do a two-pass sort on the bricks: once for shape, then a separate pass for color.) He continues to refine the system, with a focus on making its recognition abilities faster. At some point down the line, he plans to make the software portion open source. You're on your own as far as building conveyer belts, bins, and so forth.

Check out Mattheij's writeup in two parts for more information. It starts with an overview of the story, followed up with a deep dive on the software. He's also tweeting about the project (among other things). And if you look around a bit, you'll find bulk LEGO brick auctions online—it's definitely a thing!

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Name the Author Based on the Character
May 23, 2017
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