CLOSE
Original image
Flickr: slackferno

18 Stunning Black-Light-Responsive Tattoos

Original image
Flickr: slackferno

While UV-responsive tattoos are still fairly rare (many people don’t want to bother with ink that’s almost never going to be seen), they can offer a unique way to accentuate a design or to get a tattoo in a highly visible area without having to worry about the potential social consequences it may carry. Here are a few creative and cool tattoos as seen under black light.

1. Think

Here’s one that all Flossers should appreciate—a brain with the word “Think."  Better yet, part of the brain lights up when put under a black light. Excellent tattoo, Flickr user slackferno.

2. Skeleton

Plenty of people have tattoos showing their skeletal structure, but the look becomes far cooler when it only shows up under a black light. This great piece was done for Jason R. by Richie Streate of The Dungeon Inc. in Canon City, CO.

3. The Dark Mark

When the Dark Mark lights up, you know things are about to get serious. DeviantArt user Ravensfool had this great piece done by the same Richie of The Dungeon Inc. that did the skeleton arm above.

4. Yoda

Black light tattoos offer a unique opportunity to make your design more interactive. In this case, Kenneth Bryan of Intimate Body Art Studios made Yoda poised for battle in regular light, but with a little UV, his lightsaber is ready to strike down the Dark Side.

5. Cthulhu

Similarly, UV tattoo ink can add an extra layer of detail to a tattoo so it can really pop under any type of light. For example, Flickr user graysong's friend Tom's Cthulhu tattoo looks great under regular light, but under a black light, accents on the monster and the moon make the design particularly intimidating.

6. Book Worm

Knuckle tattoos can make it harder for you to find a job, but with tattoos that only show up under a black light, your dedication to literature can be permanently inked on your fists without risking your future job prospects. Flickr user astrobri, whose art was done by Ron at Adrenaline, took full advantage of this fact.

7. Moogle

Running out of space on your sleeve? Don’t worry, you can always get in a few more fun drawings with UV ink—like this moogle on Flickr user Bio Hally.

8. Transformers

Talk about more than meets the eye: This great tattoo on DeviantArt user ShinigamisPet features an outline only visible under UV light and the word “Nerd” in cybertronix, the language of the Transformers.

9. Buddy Christ

No word on who sports Buddy Christ from Dogma, but James of Nashville Ink certainly did a great job rendering him in UV-responsive ink.

10. Cupcake

Most UV tattoos contain only one shade that glows, but this cupcake by DeviantArt user Inkedromeo18 looks particularly tasty under the black light because it has so many fun colors.

11. Zelda

With all the puzzle-solving in Zelda games, it’s only fitting that DeviantArt user DarkAngelNeo’s Triforce tattoo is only visible under a black light.

12. Another Zelda

Here’s another fantastic Zelda UV tattoo, this one done by DeviantArt user Klanklang’s brother.

13. Space Invaders

Prefer your video game tattoos to be even more old school? Then you'll love Flickr user Alan Swan's Space Invader.

14. Geek Madness

Here’s a great geek black light tattoo sported by Flickr user ThumperWabbt’s son. It features the Dharma Initiative logo from the TV show Lost with the number 42 from the Hitchhiker’s Guide. The two go together particularly well when you consider all the mysteries and oddities of the two series.

15. Apple Pirate

Speaking of awesome geek ink, any Apple fan should be able to appreciate the Apple and crossbones done by artist Art Hullender and worn by Flickr user TheMadapple.

16. The Cheshire Cat

The magic of the Cheshire Cat is that he can disappear and reappear at will, often leaving nothing but his charming eyes and smile behind. DeviantArt user RefculNatas pays appropriate homage to the creature with this tattoo that only reveals the body of the cat under black light.

17. A Goldfish

It doesn’t matter if DeviantArt user starlitefairy24 is under regular light or a black light because her cute little fish, done by her boyfriend, will always be visible. In fact, since she got this tattoo, she also had the eye touched up with clear UV ink.

18. Avatar

It’s hard to capture the magic of Avatar’s Pandora in tattoo form, but DeviantArt user danktat comes close with this tattoo of Neytiri complete with UV-reactive glowing accents on her face.

Since glow in the dark tattoo ink is particularly uncommon, potentially dangerous and occasionally itchy, UV tattoos are currently the closest we can get to making our own bodies glow like those of the Na’vi. Would you guys ever get a black light tattoo and if so, what would you get?

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

Original image
iStock
Sponsor Content: BarkBox
arrow
8 Common Dog Behaviors, Decoded
May 25, 2017
Original image
iStock

Dogs are a lot more complicated than we give them credit for. As a result, sometimes things get lost in translation. We’ve yet to invent a dog-to-English translator, but there are certain behaviors you can learn to read in order to better understand what your dog is trying to tell you. The more tuned-in you are to your dog’s emotions, the better you’ll be able to respond—whether that means giving her some space or welcoming a wet, slobbery kiss. 

1. What you’ll see: Your dog is standing with his legs and body relaxed and tail low. His ears are up, but not pointed forward. His mouth is slightly open, he’s panting lightly, and his tongue is loose. His eyes? Soft or maybe slightly squinty from getting his smile on.

What it means: “Hey there, friend!” Your pup is in a calm, relaxed state. He’s open to mingling, which means you can feel comfortable letting friends say hi.

2. What you’ll see: Your dog is standing with her body leaning forward. Her ears are erect and angled forward—or have at least perked up if they’re floppy—and her mouth is closed. Her tail might be sticking out horizontally or sticking straight up and wagging slightly.

What it means: “Hark! Who goes there?!” Something caught your pup’s attention and now she’s on high alert, trying to discern whether or not the person, animal, or situation is a threat. She’ll likely stay on guard until she feels safe or becomes distracted.

3. What you’ll see: Your dog is standing, leaning slightly forward. His body and legs are tense, and his hackles—those hairs along his back and neck—are raised. His tail is stiff and twitching, not swooping playfully. His mouth is open, teeth are exposed, and he may be snarling, snapping, or barking excessively.

What it means: “Don’t mess with me!” This dog is asserting his social dominance and letting others know that he might attack if they don’t defer accordingly. A dog in this stance could be either offensively aggressive or defensively aggressive. If you encounter a dog in this state, play it safe and back away slowly without making eye contact.

4. What you’ll see: As another dog approaches, your dog lies down on his back with his tail tucked in between his legs. His paws are tucked in too, his ears are flat, and he isn’t making direct eye contact with the other dog standing over him.

What it means: “I come in peace!” Your pooch is displaying signs of submission to a more dominant dog, conveying total surrender to avoid physical confrontation. Other, less obvious, signs of submission include ears that are flattened back against the head, an avoidance of eye contact, a tongue flick, and bared teeth. Yup—a dog might bare his teeth while still being submissive, but they’ll likely be clenched together, the lips opened horizontally rather than curled up to show the front canines. A submissive dog will also slink backward or inward rather than forward, which would indicate more aggressive behavior.

5. What you’ll see: Your dog is crouching with her back hunched, tail tucked, and the corner of her mouth pulled back with lips slightly curled. Her shoulders, or hackles, are raised and her ears are flattened. She’s avoiding eye contact.

What it means: “I’m scared, but will fight you if I have to.” This dog’s fight or flight instincts have been activated. It’s best to keep your distance from a dog in this emotional state because she could attack if she feels cornered.

6. What you’ll see: You’re staring at your dog, holding eye contact. Your dog looks away from you, tentatively looks back, then looks away again. After some time, he licks his chops and yawns.

What it means: “I don’t know what’s going on and it’s weirding me out.” Your dog doesn’t know what to make of the situation, but rather than nipping or barking, he’ll stick to behaviors he knows are OK, like yawning, licking his chops, or shaking as if he’s wet. You’ll want to intervene by removing whatever it is causing him discomfort—such as an overly grabby child—and giving him some space to relax.

7. What you’ll see: Your dog has her front paws bent and lowered onto the ground with her rear in the air. Her body is relaxed, loose, and wiggly, and her tail is up and wagging from side to side. She might also let out a high-pitched or impatient bark.

What it means: “What’s the hold up? Let’s play!” This classic stance, known to dog trainers and behaviorists as “the play bow,” is a sign she’s ready to let the good times roll. Get ready for a round of fetch or tug of war, or for a good long outing at the dog park.

8. What you’ll see: You’ve just gotten home from work and your dog rushes over. He can’t stop wiggling his backside, and he may even lower himself into a giant stretch, like he’s doing yoga.

What it means: “OhmygoshImsohappytoseeyou I love you so much you’re my best friend foreverandeverandever!!!!” This one’s easy: Your pup is overjoyed his BFF is back. That big stretch is something dogs don’t pull out for just anyone; they save that for the people they truly love. Show him you feel the same way with a good belly rub and a handful of his favorite treats.

The best way to say “I love you” in dog? A monthly subscription to BarkBox. Your favorite pup will get a package filled with treats, toys, and other good stuff (and in return, you’ll probably get lots of sloppy kisses). Visit BarkBox to learn more.

SECTIONS
BIG QUESTIONS
BIG QUESTIONS
WEATHER WATCH
BE THE CHANGE
JOB SECRETS
QUIZZES
WORLD WAR 1
SMART SHOPPING
STONES, BONES, & WRECKS
#TBT
THE PRESIDENTS
WORDS
RETROBITUARIES