Topic: perception

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TED Ed: What are those floaty things in your eye?

Have you ever seen something small and strangely transparent float into your field of vision? ...as if it's on your eyeball? No, you're not seeing things! And no, those are not microscopic bugs or bits of dust in ...

Stay In Queue (2006): A lesson about staying in line

From Ferdinand Lutz, music by Dominik Mueller, this is STAY IN QUEUE (2006), which has also become a classic gif. Watch more animated videos about humor, bears, and perception.

Mars Loops the Loop: What is retrograde motion?

What is retrograde motion and why does a planet like Mars appear to change directions in the night sky? Is it playfully looping about in its orbit around the sun or is something less strange going on? From episode 2 o...

Kokichi Sugihara’s Impossible Rooftop & Folding Ladder Illusions

File under impossible objects, this is the Impossible Rooftop Illusion or "Anti-Gravity Two Sided Roof" by Meiji University's Professor Kokichi Sugihara in 2013. Using computer software, Sugihara creates award-winning...

Minute Physics: Why Is The Sun Yellow and The Sky Blue?

Why is the sun yellow and the sky blue? Why can we see the stars at night? Why is space black? And why is the sky more red, orange, and even pink at sunset? In this Minute Physics episode, we leap into "the grand ball...

Breaking Wave: An anamorphic kinetic sculpture

Small planet-like spheres hang on several miles of wire rope in this kinetic sculpture created by Plebian Design and Hypersonic. The 804 wooden spheres' heights and relationships are changed by the rows of rotating sh...

Minute Physics: Why are Stars Star-Shaped?

If we know that stars are massive spheres of hot gases, then why do we draw them with lots of twinkly points? Why doesn't "star-shaped" mean a round shape? The answer: We see stars as pointy (and so does the Hubble Sp...

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 ...

Bernard Pras’ anamorphic portrait of Ferdinand Cheval

At the at Palais Idéal du Facteur Cheval, in Hauterives, France, there's a piece by French painter, photographer and sculptor Bernard Pras that transforms seemingly broken objects into a portrait of French postman and...

OK Go: The Writing’s on the Wall

A four-minute, epic one-take video that adds to their highly ambitious visual collection of music, this is OK Go's The Writing's on the Wall. The series of forced perspective and anamorphic illusions, with a few gravi...

Amelymeloptical Illusion: A ring performance

Amelymeloptical Illusion, a seemingly simple yet enthralling rings performance from French juggler Lindzee Poi.

Reversing Arrow Illusion

We just tried this super easy Reversing Arrow Illusion, and it is, in fact, super easy. Draw two left-pointing arrows on a piece of paper and then put a clear, empty glass between you and thos...

Fred Astaire’s famous dance scene in Royal Wedding (1951)

Hang on to your chairs and lamps. This is You’re All the World to Me, Fred Astaire’s famous 1951 dance scene in Royal Wedding. How did he do it? We’re keeping that under wraps at...

Rotating head illusion

Swiss painter, sculptor, and photographer Markus Raetz creates lyrical art that explores illusion and perception. In the piece above, rotating leaves of cut metal reveal a “turning”...

Amazing T-Rex Illusion

This T-Rex will turn its head to watch you as you move. But how?? YouTube illusionist Brusspup shares the secret with this Jerry Andrus-inspired trick. And if you want to try it out yourself, Brusspup made these green...

Why Do I Study Physics? by Xiangjun Shi

"Physics told me some crazy stuff. Say, I’m not just sitting here doing nothing. I’m actually fighting against Earth’s gravity. And I’m not sitting still. I’m spinning at a thousand miles...

NPR: Why Can’t We Walk Straight?

Here’s a fascinating science experiment that we’ll be trying this weekend:  Put a blindfold on someone, take them to a park or a beach or a meadow and ask them to walk for as long as they can in a strai...

ASAP Science: Can you trust your eyes?

Can you trust your eyes? This episode of ASAPscience gives you reasons to think about your answer.

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