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Feel Art Again: Art Theft

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Yesterday afternoon, four paintings were stolen from the E.G. Buehrle Collection in Switzerland in the largest art robbery in Switzerland's history. Three men in ski masks stole the paintings at gunpoint at 4:30 p.m., half an hour before the museum's closing. The four paintings—Claude Monet's "Poppy Field at Vetheuil," Paul Cézanne's "Boy in the Red Waistcoat," Edgar Degas' "Count Lepic and his Daughters," and Vincent van Gogh's "Blooming Chestnut Branches"—were stolen so quickly (only three minutes) that the 15 visitors in the museum were not aware of the robbery until the alarms sounded. The theft has drawn enormous media attention, covered by the New York Times, USA Today, and Time. There is a $900,000 reward for information leading to the recovery of the paintings.

Today's "˜Feel Art Again' is a special art theft edition. We'll take a look at all four artists and their paintings. (If you haven't read them already, check out the previous posts on Degas and van Gogh.)


1. "Poppy Field at Vetheuil," Claude Monet
Claude Monet started his artistic career in his teens while attending the Le Havre secondary school of the arts. He would sell charcoal caricatures for ten to twenty francs. His paintings are now worth several millions of dollars and have been the target of art thefts before. "Cliffs Near Dieppe" was stolen in 1998, after which it was recovered, only to be stolen again this past August; it is still missing. A larger version of the painting is available here.


2. "Boy in the Red Waistcoat," Paul Cézanne
Both Matisse and Picasso are said to have remarked that Paul Cézanne "is the father of us all," as his style bridged the gap between Impressionism and Cubism. Although three alternate versions of "Boy in the Red Waistcoat" reside in museums in the United States, the stolen painting is still worth about $100 million (the bulk of the value of the theft). Emil Georg Buehrle had considered the piece to be "the signature painting of his collection." A larger version of the painting is available here.


3. "Count Lepic and his Daughters," Edgar Degas
Unlike most family portraits, "Count Lepic and his Daughters" was not commissioned. Ludovic Lepic was a friend of the Impressionists and, as a sculptor, also exhibited with them. Edgar Degas again painted the father and daughters in "Place de la Concorde." Degas honed his skills copying paintings at the Louvre, where he met Édouard Manet. (Claude Monet had also met Manet during visits to the Louvre.) A larger version of the painting is available here.


4. "Blooming Chestnut Branches," Vincent van Gogh
"Blooming Chestnut Branches" was painted in Auvers-sur-Oise, where Camille Pissarro (discussed in November) and Paul Cézanne had also worked. After van Gogh's death, the painting passed into the hands of Dr. Paul Gachet, who had taken care of van Gogh and had hosted the artist in Auvers-sur-Oise. A larger version of the painting is available here.

'Feel Art Again' appears every Tuesday and Thursday.

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iStock // Ekaterina Minaeva
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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Opening Ceremony
These $425 Jeans Can Turn Into Jorts
May 19, 2017
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Opening Ceremony

Modular clothing used to consist of something simple, like a reversible jacket. Today, it’s a $425 pair of detachable jeans.

Apparel retailer Opening Ceremony recently debuted a pair of “2 in 1 Y/Project” trousers that look fairly peculiar. The legs are held to the crotch by a pair of loops, creating a disjointed C-3PO effect. Undo the loops and you can now remove the legs entirely, leaving a pair of jean shorts in their wake. The result goes from this:


Opening Ceremony

To this:


Opening Ceremony

The company also offers a slightly different cut with button tabs in black for $460. If these aren’t audacious enough for you, the Y/Project line includes jumpsuits with removable legs and garter-equipped jeans.

[h/t Mashable]