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At the Libraries: Your Weekly Round-Up

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Every Wednesday, Miss Kathleen provides links to a variety of things happening at libraries across the country. If there's something fun going on in your local library this week, leave us a comment!

Travel to Italy, by way of the Oakland (CA) Public Library! In honor of Lonely Planet's latest travel book series, writer Alison Bing will give an interactive presentation all about Italian travel. Share your stories or plan your trip -- it's even more fun than a book! (Search for "Italy" on this page.)
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Ever wonder what goes through the head of the author of a banned or threatened book when they hear the news? Read this article by the hilarious Dan Gutman for an insider's view.
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And what can a parent do if the library won't remove books he or she deem offensive? One mom decided to hold the books hostage! She recently relented, but I wonder if she's paid the fines yet?
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Speaking of overdue fees, another chink has appeared in George Washington's armor: he never returned two library books! He's got a whopping fine now. First we find out there was no cherry tree, now this. What's next?
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The Canton (MI) Public Library offers lots of great programs and classes (including how to use that digital camera!), but they also have a beautiful installation in their children's room (above). It's not a real tree, but it is just amazing!

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The Santa Fe Public Library loves to showcase local art and artists (in addition to all of its great books, of course). They frequently post a Call for Artists, so if you are in the area and artistically minded, pick up an application.
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Live in Brooklyn? Want to learn to tango? Well then head over the Central Branch of the BPL for Tango lessons! The BPL also has a Philosophy Discussion Group if you prefer to flex your mind and not your muscles.
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Portland, Oregon, would be a great city to live in for lots of reasons (mostly food - I am dying to visit and eat my face off), not the least of which is Multnomah County Library. They have the usual book clubs and computer classes, but also so much more—including a cool series to help you get more out of your life! Check out the events schedule for Life by Design.
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We missed Library Snapshot Day, where people shared pictures of their library on a particular day, but that's okay. We can have our own Library Photo Day instead! Send me pictures of your library, inside or out, and we'll see if we can put them up in next week's column! (You can reach me here: atthelibraries@gmail.com.)

Here's a picture of my library the day we celebrated our 10th birthday with a cake-baking contest.

See previous installments of At the Libraries here.

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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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Opening Ceremony
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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:

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Opening Ceremony

To this:

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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]

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