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]

Learn to Paint Like Bob Ross in an Upcoming Facebook Live Event

Public television hero Bob Ross may no longer be with us, but you can still paint happy little trees in his honor. October 29, 2018 marks what would have been the 76th birthday of the beloved art teacher to the masses, and to honor his memory, the Quarto Group—publisher of the new book Painting With Bob Ross—is hosting a live-streamed painting party online.

Painting With Bob Ross provides step-by-step instructions to help you create some of the master’s favorite oil landscapes on your own. While Quarto’s October 23 painting party (a collaboration with Bob Ross, Inc.) can’t teach you how to mimic Ross's soothing voice, the celebration does include a painting session with Bernie Oropallo, a Certified Ross Instructor, who will demonstrate the techniques that Ross taught on The Joy of Painting.

Promo for The Quarto Group's Bob Ross painting party
The Quarto Group

The live-streamed instructional session will take place within the offices of a youth arts center in Beverly, Massachusetts, called Express Yourself. Oropallo will lead you through the process of painting “Distant Mountains,” one of the artworks included in the new book.

The painting lesson kicks off at 7:30 p.m. ET on October 23. To participate, log onto Facebook and head to the QuartoCreates page to join the live event. Before it starts, check out the event page here for a list of the supplies you’ll need to complete the painting. If you can’t make it to a computer that night, grab Painting With Bob Ross on Amazon ($15) to get the next best thing. If that’s not enough for you, we suggest you curl up with the official Bob Ross art book and/or a Bob Ross coloring book.

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