Topic:circle

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The infinite life of pi

The ratio of a circle's circumference to its diameter is always the same: 3.14159... and on and on (literally!) forever. This irrational number, pi, has an infinite number of digits, so we'll never figure out its exac...

Cycling, a LEGO Technic creation by Yoshihito Isogawa

A round yellow track made from LEGO's circular gear rack, also referred to as four 'banana' gears, spins as a bicycle rider rides inside of it. This cycling creation was built by Japanese pro LEGO builder Yoshihito Is...

How to draw a circle without a compass

Gather three sharpened pencils, three rubber bands, a few paper clips, some cardboard, a push pin, some string, and some paper to try these five solutions: How to draw a circle without a compass. Don't have that much ...

A full circle rainbow as seen from a construction crane

High over St. Petersburg, Russia, from the top of a construction crane at the Lakhta Center, a huge rainbow can be seen in its full form: a circle. Phil Plait explains the science in his 2014 Bad Astronomy article: ...

Robotic Loop: Train vs. Robot

Mechanical engineering student Christian Schürch programmed a FANUC M-2iA/3S robot to assemble and disassemble two tracks for a traveling toy train. Schürch constructed gripper fingers for the school project, as well....

Calculating Pi (π) with Darts

Can you calculate Pi (π) by throwing darts at a square and circle target as randomly as possible? Physics Girl's Dianna Cowern and Veritasium's Derek Muller attempt the challenge, and when "randomly" doesn't happen, t...

A Circle Thief (まるどろぼう)

A subway rider diligently attempts to thwart the circle thief who is taking all of the useful round objects: A Circle Thief (まるどろぼう) by Tokyo-based art and design student Komoto.

Dance of Harmony, an animated synesthetic voyage

One day when I was sixteen, I realized that I could see music. The saxophone I played and the jazz I loved listening to came to life before my eyes, or perhaps behind my eyes, in shape and color — little animated char...

The Magic Roundabout in Swindon, England

Five small roundabouts placed around one large one... this is Swindon's Magic Roundabout and it's been going strong since it was built in 1972. Wired explains how this multi-directional traffic circle works. Tom Sc...

Ambiguous Cylinder Illusion by Kokichi Sugihara

Second place winner of the Best Illusion of the Year Contest 2016, this is the Ambiguous Cylinder Illusion by mathematics professor Kokichi Sugihara of Meiji University in Tokyo, Japan. The direct views of the obj...

Ma’agalim, Jane Bordeaux, & journeys inside an old penny arcade

"In a forgotten old penny arcade a wooden doll is stuck in place and time." This is Ma'agalim (Circles), a beautifully animated music video by Tel Aviv-based band Jane Bordeaux and director Uri Lotan.

I Haven’t Seen You In Forever – They Might Be Giants

"I haven’t seen you in forever I’m so sad cause I missed you so much..." and yet sometimes our emotions run the gamut. From They Might Be Giants' Dial-A-Song-Direct, an experiment in which the band sent subscribers on...

Circular motion demonstration with a sparkler & a hula hoop

From physics teacher and film maker Alom Shaha, check out these simple demonstrations showing how something moving in a circle will move in a straight line when you remove the centripetal force acting upon that thing....

Mathematical Present Wrapping with Katie Steckles

When you're wrapping a variety of shapes, it can be a challenge to wrap them neatly, but with a bit of measuring, thoughtful folding, and practice, your cuboid, pentahedron or equilateral triangular prism, cylinder, o...

The Dot & the Line: A Romance in Lower Mathematics (1965)

Winner of the Academy Award for Animated Short Film in 1965, and adapted from the celebrated book by Norton Juster, best-known for Phantom Tollbooth, this is The Dot and the Line: A Romance in Lower Mathematics. Th...

Joni Mitchell performs The Circle Game

From the Canadian Broadcasting Corporation's The Way It Is television program, this is Joni Mitchell singing The Circle Game in 1968, a favorite with the kiddos in our house. Start the video from the beginning to see ...

Sesame Street: The 30 Dots Collection

Classic patterns and surprises! Sesame Street's 1970s era series about 30 dots has been collected into 13 segments by YouTube user Monsterpiece Theatre. Debuting as an animation set by You’re a Good Man, Charlie Brown...

The Crazy Circle Illusion – How are these dots moving?

In this Brusspup mind-bender, you may think you see a circle of eight white dots rotating around the inside of a larger red circle, but you're actually witnessing something else, and you may not believe it unless you ...

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