This Spinning Arrow Might Make You Question Your Sense of Direction

'Round and 'round the arrow goes, but where it points—nobody knows. As spotted by Sploid, this befuddling optical illusion of a spinning arrow appears to be pointing right no matter how many 180-degree turns you give it. See for yourself:

Right Pointing Arrow: spin this arrow 180 degrees and it still points to the right- only in a mirror will it point left (and only to the left). Another incredible ambiguous object illusion by mathematician Kokichi Sugihara of Meiji University in Japan, the inventor of this illusion and art form. A clever combination of reflection, perspective, and viewing angle produce this striking illusion. ➡️ Follow the link in my profile for info about where to get this illusion arrow and other amazing items featured here on @physicsfun #illusion #ambiguouscylinderillusion #ambiguouscylinder #geometry #mirrorreflection #physics #ambiguousobject #kokichisugihara #physicstoy #math #mathtoy #mathstoy #optics #opticalillusion #3dprinting #perspective #science #scienceisawesome

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The illusion was designed by Kokichi Sugihara, a mathematics professor at Meiji University in Japan. Sugihara is adept at creating 3D objects that seem to defy the laws of physics, using a “combination of reflection, perspective, and viewing angle” to trick viewers, according to the physicsfun Instagram page, which posted the video.

The effect still works when the object is held up to a mirror, although instead of pointing right, the reflection shows the arrow pointing left each time. The object appears symmetrical when viewed from above, but when you look at it head-on, it appears to come to a point on one side. It all comes down to the way the edge is carved—a testament not only to Sugihara's mathematical ability, but also his craftiness.

Want to see more of Sugihara’s work? In another video, a rack of cylinders appears to be transformed into a rack of rectangles right before your eyes.

[h/t Sploid]

New Harry Potter Scrabble Accepts Wizarding Words Like Hogwarts and Dobby

USAopoly
USAopoly

Patronus, Hogwarts, and Dobby may not be words found in the official Scrabble dictionary, but they are very real to Harry Potter fans. Now there's finally a board game that lets players win points using the magical vocabulary made famous by the Harry Potter books and movies. SCRABBLE: World of Harry Potter from USAopoly is a new edition of Scrabble that recognizes characters, place names, spells, and potions from J.K. Rowling's Wizarding World.

Like traditional Scrabble, players use the letter tiles they pick up to spell out words on the board, with different words earning different point values. Any word you can find in an up-to-date Merriam-Webster Dictionary is still fair game, but in this version, terms coined in Harry Potter qualify as well. First and last names, whether they belong to characters (Albus or Dumbledore, for example) or actors from the franchise (Emma or Watson), are playable. You can also spell magical place names (like Hogsmeade), spells (accio), and objects (snitch).

Harry Potter version of Scrabble.
USAopoly

Showing off the depth of your Harry Potter knowledge isn't the only reason to put wizarding words on the board. Magical words are worth bonus points, with players earning more points the longer the word is. SCRABBLE: World of Harry Potter also includes cards with special challenges for players—a feature that can't be found in any other version of the game.

This Harry Potter edition of Scrabble will be available for $30 at Barnes & Noble and other retailers this spring. Until then, there are plenty of Harry Potter-themed games, including wizarding chess, out there for you to play.

Harry Potter version of Scrabble.
USAopoly

This 1980s Copy of Super Mario Bros. Is One of the Most Expensive Video Games in History

iStock.com/ilbusca
iStock.com/ilbusca

The original Super Mario Bros. changed video games forever when Nintendo released it for the NES in the 1980s, and now it's making history again. As The Verge reports, a mint cartridge from 1985 just sold for $100,150, breaking a world record in video game sales.

Super Mario Bros. was the first game starring Mario that Nintendo released for a home console. Most old copies of the game from the 1980s show noticeable wear, but the item that just sold through Heritage Auctions was a rare find for collectors. The cartridge is still preserved in its sealed case, earning it a "near mint" grade of 9.4 and a A++ "seal rating" from the rare game certifiers Wata Games.

It's also a rare "sticker-sealed" copy that Nintendo created for an exclusive test market launch of the NES in New York and Los Angeles. That, along with the game's pristine condition, helped make it the most expensive graded game ever sold when a group of collectors purchased it for $100,150 at auction.

Super Mario Bros. helped launch a video game franchise and paved the way for some of Nintendo's most famous properties, including Mario Cart and Super Smash Bros. It's one of several old-school NES games that collectors are willing to shell out big bucks for. Stadium Events, the 1990 Nintendo World Championships (one sold in 2014 for $100,088), and the Nintendo Campus Challenge are also very rare and expensive.

[h/t The Verge]

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