The Gömböc is an object with only one two equilibrium points, one stable and one unstable

According to the Action Man, "The Gömböc is the world's first three-dimensional convex and homogeneous shape that has only one stable and one unstable equilibrium point." Interestingly, the shape is similar to certain kinds of turtles. If one of these turtles is turned upside down, gravity will turn it right side up.

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Cathryn Aison and Philip Glass's lovely abstract animation for Sesame Street (1979)

In 1979, Sesame Street animator Cathryn Aison created "Geometry of Circles," an abstract animation with original music by minimalist pioneer Philip Glass. It consists of four segments that were first aired as a complete piece. From the Muppet Wiki:

The shorts consist of the movement of six circles (each with a different color of the rainbow) that are formed by and split up into various geometric patterns. Glass's music underscores the animation in a style that closely resembles the "Dance" numbers and the North Star vignettes written during the same time period as his Einstein on the Beach opera.

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How many triangles do you see?

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A post shared by Popular Mechanics Magazine (@popularmechanics) on Jan 29, 2020 at 12:14pm PST

Sure, you can count them. I did, and, er, I missed a few. Or you can take one of the approaches suggested by the mathematics professors that Andrew Daniels interviewed in Popular Mechanics:

“I would approach this just like one approaches any mathematical problem: reduce it and find structure,” says Sylvester Eriksson-Bique, Ph.D., a postdoctoral fellow with the University of California Los Angeles’s math department.

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Embodied logic: Using stimuli-responsive materials and geometric principles to create smart objects

A new paper in Nature describes the US-Army-funded research of U Penn materials scientists to create a new generation of 3D printed "smart objects" whose geometry and materials enable them to interact with their environments without having to use embedded computers, sensors or actuators. Read the rest

Make your own M.C. Escher-style metamorphosis

The Metamorphosis Machine generates tessellating art in the style of M.C. Escher. It's a companion to an online documentary about his life and work built around an interactive, high-resolution image of Metamorphosis II, the print that established his fame.

Here's mine, metamorphosing a five-pointed star into the Cool S. Read the rest

Watch how to 3D print freaky, wobbly sphericons

After seeing a successful Kickstarter project, Angus from Makers Muse has been experimenting with sphericons, unusual shapes that meander when they roll. Read the rest

A ball that inverts and changes color when it is midair, and the scientific literature that explains it

The Hoberman Switch Pitch Throwing Ball is a $12 toy that instantiates a dual polyhedron: every time you throw it, it turns inside-out; there's a wealth of scientific literature that explains how this works, including this open-access paper from the Journal of the International Association for Shell and Spatial Structures. Here's JWZ's summary: "The curved body panels that make it look like a sphere hide an internal structure that is a cube; or really, two tetrahedrons embedded in a cube; and when it its its activation energy, the tetrahedron becomes its dual, swapping faces and vertices." Read the rest

How to make those fancy geometric pies by lokokitchen

Seattle-based self-taught baker Lauren Ko of Loko Kitchen was inspired to start making her now-viral geometric pies after seeing some cool ones on Pinterest.

For Pi Day, Tasty posted this video of Ko telling her story while showing us step-by-step how she does her thing. It's so satisfying to watch, esp. that sped-up crust-weaving part.

Be sure to follow her pie-making adventures on Instagram. Since she started it in August 2017, she's gained over 150K followers, including Martha Stewart.

Here's a taste:

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Friend or foetato? 🥔| Spud redux of my pear tart with red, purple, New, and sweet potatoes (all hand-sliced because I’m a masochist and I still can’t decide on a mandolin) and melty Raclette. Carbz and cheese: the lifespud of Mondays, amirite? 🧀

A post shared by Lauren Ko (@lokokitchen) on Dec 4, 2017 at 6:55pm PST

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Dressed to the lines. 〰️| How else does one mow through @costco quantities of butter, flour, and sweet potatoes but with pie? Last week, I was scrounging the pantry. This week, I’m clearing house. #notsponsored, just anti-hoarding

A post shared by Lauren Ko (@lokokitchen) on Jan 9, 2018 at 12:22pm PST

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What’s love quat to do with it? 🍊| Chocolate tart with chocolate glaze from @epicurious tiled with tangy kumquats. With Valentine’s approaching, consider this one luxuriant way to help you say “Kumquat may, I’ll love you to my pieing day.” (Even if it’s to yourself because let’s be real, you deserve every last crumbquat.)

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These deliciously geometric pies are almost too pretty to eat

Lauren Ko of LOKOKITCHEN in Seattle bakes up pies and tarts that are so creative that fans might feel bad slicing into them. Read the rest

"The efficiency gap": understanding the math behind a crucial Supreme Court gerrymandering case

Last October, the Supreme Court heard argument in Gill v. Whitford, a Wisconsin gerrymandering case that has far-reaching implications for the November midterms in 2018; the court is expected to rule next June. Read the rest

Max Brückner’s polyhedral models

The German geometer Max Brückner was fascinated by polyhedra, and he wrote about them in depth in his 1900 work Polygons and Polyhedra: Theory and History.

Over at the Internet Archive, they've scanned the book, and if you flip to the end -- beginning at page 243 -- there's a real visual treat: Several pages of Brückner's line drawings of polyhedra, followed by photos of his collection of 3D polyhedral objects.

The Public Domain Review recently unearthed these, and now I want some of these pages blown up to poster-size for my walls!

(You can seem more of these screenshots over at the Public Domain Review's post.) Read the rest

Watch a mathematician explore non-euclidian geometry with a VR headset

Mathematician Henry Sagerman and colleagues developed a cool way to observe non-euclidian geometry from a new vantage point: inside the geometry itself via virtual reality. Read the rest

José Bernabé's organic geometry

Graphic designer José Bernabé explores a lot of wonderful concepts as part of his work, including this standalone project titled Organic Geometry. Note: if you click this link to see more, there's a supremely annoying autoplaying song embedded. Read the rest

Video of cube passing through hole in equally sized cube

If you have two cubes of equal size, it's possible to cut a hole in one cube that's large enough for the other cube to pass through it.

From Wikipedia:

In geometry, Prince Rupert's cube (named after Prince Rupert of the Rhine) is the largest cube that can pass through a hole cut through a unit cube, i.e. through a cube whose sides have length 1, without splitting the cube into two pieces. Its side length is approximately 6% larger than that of the unit cube through which it passes. The problem of finding the largest square that lies entirely within a unit cube is closely related, and has the same solution.

The original proposition posed by Prince Rupert of the Rhine was that a cube could be passed through a hole made in another cube of the same size without splitting the cube into two pieces.

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iRuler is a website that turns your screen into an inaccurate ruler detects the dimensions and resolution of your display and then displays a rule upon it. In the photo above, I've placed a real ruler on the screen (above) to verify the accuracy of the iRuler (below). Good enough for me! Read the rest

Watch mesmerizing forms complement the music of Symmetry

Symmetry is a single by Max Cooper and Tom Hodge from Max's EP Emergence. Designer Kevin McGloughlin created a stunning video of teal and copper concentric circles morphing and meshing in surprising and hypnotic ways. Read the rest

How Eratosthenes calculated the circumference of the Earth in 200 BC

High school teacher Joe Howard made another excellent math video. This time, he shows how Eratosthenes calculated the circumference of the Earth in 200 BC.

In one of the dopest displays of critical thinking in history, Erotosthenes estimated the circumference of the Earth. All he had was a pole, the sun, knowledge of a famous well in Egypt, and potentially money to pay someone to walk the distance between two cities. This story demonstrates the beauty of trigonometry.

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