#### Am Vor 7 years

Matt Parker, comedian and mathematician, shows how four-dimensional shapes appear in a 3D world in this hands-on talk, featuring what is possibly the world's nerdiest knitted hat!

Subscribe for weekly science videos: bit.ly/RiSubscRibe

Buy Matt's book "Things to Make and Do in the Fourth Dimension" - geni.us/M2MIA

Discover how to make love hearts from Mobius strips, 4D frames from drinking straws and pipe-cleaners, and other maths tricks in this entertaining talk by Matt Parker. Matt explains how to know when someone's throwing a 4D cubes at you and also what happens when your mum knits a three dimensional shadow of a four dimensional donut - to wear on your head, in this fun talk on the challenges of visualising the fourth dimension.

Matt Parker was an Australian school teacher before he moved to London where he works as a stand-up comedian and a maths communicator. He writes books, appears on radio programmes and TV shows, contributes to newspapers, makes school visits and gives live comedy shows.

This event took place at the Royal Institution on Tuesday 27 January 2015.

The Ri is on Twitter: twitter.com/ri_science

and Facebook: facebook.com/royalinstitution

and Tumblr: ri-science.tumblr.com/

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Our editorial policy: www.rigb.org/home/editorial-po...

## KOMMENTARE

## The Royal Institution

Do you have a sudden urge to knit your own Klein bottle hat? No worries, friend, we've got you covered - https://www.dropbox.com/s/42b2gete2rfs8s4/Think%20Maths%20-%20Klein%20Bottle%20Hat.pdf?dl=0

Vor 3 years## zoklev

@Danny Tourigny bruh, do you think he's a clown or smth? he's a proper math educator

Vor 2 years## Danny Tourigny

Does this guy do birthday parties?

Vor 2 years## moonlighttech

Loved the shoelace bit, thanks!

Vor 2 years## klu android

Where are Q&A?

Vor 2 years## Tha Weezl

45 min in- and I may not be patient enough - but isn’t the 4th dimension what flatland was supposed to be about ?

Vor 2 years## Learning It Quietly

This is a wonderful lecture. I thoroughly enjoyed it as an adult; as a child I would have been spellbound.

Vor 4 years## schlumpkin

This guy made watching an hour-long math lesson very entertaining. Love the guys energy, hope he’s doing well

Vor 10 Monate## schlumpkin

@Squirrel ASMR Totally, thanks for the extra detail lol

Vor 3 Monate## Squirrel ASMR

He's balder now, hope that counts as well.

Vor 3 Monate## Mikey Chrisanthus

^ He’s demonstrated a lot of creativity in the past few years

Vor 6 Monate## the math man

He has a stand alone math channel now, look up stand up maths! He’s even better now.

Vor 7 Monate## samy7B9

I absolutely love this guy (well this professor). I cant even believe I've sat and looking at his work just over 1 hour. Brilliant work. Thank you and good luck.

Vor 2 years## Jere Lull

That's the mark of a true *educator* , which is why I'm addicted to him, too..

Vor year## Safety Inspector

look up stand up maths for more. hes got a whole youtube channel!

Vor year## Shailesh Rana

One of the best lectures I've seen on this channel. Matt Parker is amazing!

Vor 2 years## The Royal Institution

We're so glad you enjoyed it, Shailesh! We definitely agree about Matt!

Vor 2 years## Corpsegrinder

I thought about how hyperactive his speaking style is, but then I realized it's because he is super stoked about science, and that should be applauded. A nice breath of fresh air

Vor 2 years## Florea Ciprian

yea, its uncontrolled excitement and i love it

Vor 4 Monate## mgrizzlybair

My friend and I have a running joke about having a Dungeons and Dragons wizard make a Klein Bottle Bag of Holding. Since the inside IS the outside, putting something into the bag would randomly displace the object to some point inside the physical universe. Also, since if you put a portable hole or a bag of holding inside one another, they explode like a tactical nuclear device, it is possible that the act of creating the Klein Bag of Holding would instantly detonate every portable hole and every bag of holding in existence. BTW, the detonation is due to putting an extradimensional storage container inside another extradimensional storage container. This interaction has been an accepted part of D&D for decades now.

Vor 2 years## Peepock

It’s also permanently being emptied, despite containing everything because it’s inside out.

Vor 4 Monate## Jake Jones

Interesting, did you know RAW dnd worlds are non-Euclidean the spell snare creates a circle radius 5ft with a circumference of 25ft

Vor 5 Monate## Awkwardmancer

I still maintain that putting a portable hole in a bag of holding has 1% chance of creating a Klein bag of holding. Which can create black hole, white hole, make a bag with infinite capacity that nothing can be taken out of or make a bag that you can put nothing in (including any appendages), but can cough up random content of random bags of holding at random intervals.

Vor 7 Monate## Grady Pharr

This is amazing

Vor year## mgrizzlybair

@Kamanha Gaming whatever you do, don't go with 4th edition. ;)

Vor 2 years## SwimSuit

This guy is an actual legend - hilarious. I love both his ability to engage with the audience and his comedy.

Vor 2 years## Barry J. Burns

"I'm standing over a national treasure. Look at the water! The world's first electric motor was demonstrated here. I made a heart!" Classic.

Vor 2 years## Anime Banz

Matt, you now hold the record for solving a Rubik's cube while delivering a lecture at the Ri.

Vor 7 Monate## Kriss

Brilliant video, i would like to think im competent at math but i did learn quite a bit. Hats off to Matt Parker and The Royal Institution. Great job all round for presenting an interesting, engaging, informative but more importantly exciting show. Would highly recommend to others.

Vor 2 years## Mikke Boström

Brilliant, as usually! This has to be one of the top-5 channels in Youtube (with Kurtzgesat etc.). Free learning = priceless

Vor 3 years## Anna Savchenko

Thank you Matt Parker for keeping me busy during quarantine! 😂 *Making squares and hearts*

Vor 2 years## Scrub Gaming

the last thing i expected was to have the interest and motivation to watch the whole hour without breaks, but matt parker is just that good

Vor 3 years## Mark Laureta

I actually did not noticed it was 1 hour until I read your comment. His way of teaching is really entertaining.

Vor 2 years## Jason Staques

Absolutely loved it :) I'm a math nerd and a designer so this whole thing was right up my alley :)

Vor 2 years## SurrealDynamics

This guy is absolutely brilliant! He's everything that's good about passion for a subject, made into a person. We love you Matt!

Vor 2 years## C D

As a drummer, I think the fourth dimension could be thought of as rhythm. My brain constantly dissects time like crazy, even when I’m not actively thinking about it. I can merge 4/4 with many other time signatures, even if it’s for brief moments, so it mathematically works without any mental effort. It just happens for me. So in a very abstract way, I kinda get the concept of a 4th dimension.

Vor 3 years## thelaurens1996

I have a slider theory in which everything that is each others counterpart is put on an axis (goes to infinity either way) (and yes you can expand that to more dimensions but I don't want to type that out it is complicated enough as it is) So everything on an axis you can see that axis as being a dimension. If you combine two axis together, you get a higher dimension and you can use vectors in this space to combine the data (coordinates on each axis, if you want to do this and have no idea on how to frame the spot on the axis, it's relative so you have to have other points on the axis so that you can relate to those in the space and get a relative place on the scale of things. Once you have that for both axis, you can use vectors to get a combination of those, an outcome as it where. In a different dimension than the ones you used seperately. Now that point is data, but it is for you to figure out what it means, it might be an earlier undescribed correlation factor or you have to figure out if it's already an existing known fenomena for which we didn't know the linkage to the other known things. Interestingly enough there seems to be utility in most fields, even in the social and psychological fields. So you can use it for emotions or other traits as wel as other things that happen in the world. And yes you can extend this to make cubes or 4cube equivalent. (Or 5D but, that stuff is abstract yo) Otherwise intersecting waves work where the touching intersecting parts are of significance

Vor 8 Monate## Stray

The Klein Bottle is the 3D shadow of a 4D möbius loop. That's amazing.

Vor 5 years## Jason Bulloch

And all this time I’d thought the Klein bottle was a 4D Torus (Donut)

Vor 6 Monate## maciej pieskasta

THAT IS almost EXACTLY what i thought when i saw it. I imagined that if you could see that mobius loop in 4d there would be no lines which cross themselves, unlike the klein bottle

Vor 7 Monate## Eye Heisenberg

@OsoTanuki thats cool. I did get your point. I do wonder though how deep the relationship between quantum mischief and our perception of reality goes. We get what we expect out of life.

Vor 2 years## OsoTanuki

Eye Heisenberg oh, whoops, I must have not been paying attention when I was writing it. I probably meant to say where it's moving, or it's velocity

Vor 2 years## Eye Heisenberg

@OsoTanuki its not a good joke as both options are exactly the same. Where an object is, IS its position in space. Same thing

Vor 2 years## Alexandria Renard

I really do like this man, and I wish he had been one of my professors in college, he's a ton of fun!

Vor 2 years## saultube44🇺🇦

Awesome presentation, but I come here from time to time to witness kids getting their minds blown, that doesn't happen often with math, I'm glad this kids got to see the beauty and infinite possibilities of Math, that is also part of the Structure of our Universe

Vor 2 years## Bill Quillin

I truly wish you had been my professor at University. You, Sir, are awesome!

Vor 2 years## Joe Ellerbrock

What a fun and mind twisting lecture. Made me feel like a kiddo again!

Vor 3 years## Yesica1993

An old video, but I just found it. I have watched many videos that try to explain the 4D concept. They always leave my brain feeling like it's been snapped in two. I just cannot grasp even the concept. This is the first time I've felt... just a tiny bit closer to understanding it. It's only like a millimeter that my understanding has moved, but that's more than it ever has before!

Vor 3 years## R Tendo Tapiwa

I am with you on this one.

Vor 2 years## Alexis Harper

My mom is pretty cool because when I said, “Hey, that recycling symbol is a 3 turn mobius loop,” she actually said that that was cool instead of just not caring like my friends.

Vor 2 years## Christopher Sanders

I brought a paper mobius ring to show to my friends and a girl tore it up. I had my friend weld a mobius ring, and then I handed it to her. I WON. I think it's sad that that is the most petty thing I've done.

Vor 20 Tage## Wotzinator

Dont you mean knot caring?

Vor 3 Monate## JstormZx

Yea that is pretty cool. Pretty cool mom you got

Vor year## raadt maar wat

How old she is now?

Vor year## Sparrow

No one in my family expect my little sister cares about stuff like that, lucky you. ;)

Vor year## MysteryHardRocker

I absolutely love this guy. Bought his book and watched this while I waited for the delivery. He's such a funny and lovely guy! He's writing a new book and it should be out by the end of this year. Stay tuned! :)

Vor 4 years## Matt's adventures with art

I love his pride in his nerdiness about the beer can. Long live the nerds!

Vor 3 years## Michael Hourihan

What a brilliant lecture, and what a brilliant lecturer! I've loved the RI Christmas lectures since I discovered them on TV when I was about 8 years old (about 35 years ago), and I'm so glad to see the popular lectures still very popular! Long live the RI! =)

Vor 4 years## Michael Hourihan

Excellent news, I certainly will be watching! Thank you! =)

Vor 4 years## The Royal Institution

Thank you so much for your kind words. You might find this interesting - we've actually started putting together and publishing our entire back catalogue of Christmas Lectures here: http://www.rigb.org/christmas-lectures/watch . We haven't made it to the early 80s yet, but give us time and you'll be able to re-watch the very first lecture you ever saw!

Vor 4 years## Joey Prike

Probobly my favourite lecture on RI , thanks 🙏

Vor 9 Monate## Iustin Raznic

What a great piece of math. You make me want to learn even more, I love when people do that. Funny mathematics

Vor 4 years## John Yepthomi

I envy those kids with such exposures. In a good way though. It saddens me how many kids don't get such interactive exposures. Hope this video gets out to more and more kids to keep them entertained and learning. This guy is awesome.

Vor year## Tom Poleski

Matt Parker's great :D If I had a maths teacher like that when I was in school I might have even grown to like DOING maths instead of just appreciating it.

Vor 6 years## Snafu

While I agree with the idea, I found (as I actually /had/ a teacher similar to Matt) that I spent more time listening to his stories & chatter/banter than actually doing the work: in short, I failed the exam despite the teacher being very good & personable :(

Vor 3 years## Osmosis Jones

Him and James Grime. I would have killed for teachers like them in High School.

Vor 4 years## Peter

I am 30 and I consider Arithmetic the most important math course of all, simply because it's the foundation for everything else and the only course that everyone regularly uses in everyday life.

Vor 5 years## Farscryer0

No reason you can't start now. I'm 29 and I'm doing the same. Its interesting retaking secondary school maths from an adult's perspective, patience, and drive to learn.

Vor 6 years## Robert Thompson

I'm halfway through for the third time watching this video and still laughing with tears. This guy is incredible.

Vor 7 Monate## christian williams

I'm 26 and learning to tie my shoes. What have I done with my life.

Vor 2 years## Rodin Gaming

Well from now on you'll have more time to do other stuff with all the time you've saved with efficient shoelace tying

Vor year## Varshit Jain

Im 26 and im exactly at that part of the video

Vor year## The European Lynx

I think this is my new favorite comment on youtube

Vor year## Elon muskrat • 22 days ago

@John Monday oh be quiet

Vor year## Altorin

Magic the gathering had a block set based on an invasion of higher dimensional monsters called the eldrazi. The description through the lore was akin to a fisherman reaching into a pond and the fish's perspective of the fisherman's hand being how lower dimensional creatures view the eldrazi. Kind of sounds like a 4 dimensional interaction Also have you heard the idea that the entire 3d universe is a hologram projected in the event horizon of a 4d black hole? I'm sure it's inaccurate to reality but the idea completely blew my mind.

Vor 3 years## Giovani Florido

Loved it. Matt is amazing my brain just melted haha

Vor 2 years## Robert Johnson

Great presentation I couldn't stop laughing and learned a little about how twisted the 3rd & 4th Dimentions can be LOL

Vor year## ben h

18:18 I know this is a bit late, but having read the book, rearranged the knot into a useful arrangement and tested all possible pairs of crossings I can say that I am entirely sure it is impossible to untie it in two crossings.

Vor 2 years## Leo Shevkun

Such an amazing talk. Thank you!

Vor 3 years## sarahc00kies

Even after 5 years i'm loving this guys presentation!!! He's amazingly creative, smart and a great entertainer :O

Vor 2 years## David Brown

For me he's shouting too much. He could just talk more softly, the microphone is loud enough.

Vor 5 Monate## Мухаммад Рамазанов

Ава топ

Vor year## Anthony Coleman

once again, i THOROUGHLY ENJOYED this video. now officially subscribing to this channel, with a HIGH RECOMMENDATION TO ALL OTHERS TO JOIN! As always, thank you for the content! ALSO!, I find 4D perception just as perplexing as I do intriguing. I would LOVE to explain further what i mean by that, but i started to be confused by my own thoughts in that process; that I lost my bearings on my explanation (sorry). It seemed like every time I would try to create an understanding of my thoughts i would come across a "knot" that i couldn't fully explain through words. I would love to be able to learn directly from those that can articulate these ideas in a 1-on-1 environment because there are SO MANY questions i have,but would only be relevant in that setting. I am open to (LOGICAL/REASONABLE) suggestions for helping me wrap my head around these ideas.

Vor 2 years## Keyur Kulkarni

Great presentation and explanation ! It is just so hilarious and awesome when Matt just discovers what he is there to talk about by saying "And Ooh", "Anyways", "Maybe some other time".. ! 😆😆😁

Vor 2 years## DogWithWigWamz.

"4D Glass, very expensive," has to be the best line so far this millennia.

Vor 3 years## a sheep

@GDash 69 easy. "Never gonna give you up!"

Vor 4 Monate## GDash 69

what was the best line of last millenium?

Vor 2 years## TumbleGamer

I love it when he points things out and mentions it in a funny way.

Vor 4 years## mccracra

My 2nd grade class loved watching your video! They had many questions when we were learning about 3D shapes... mostly they were curious about the 4th dimension. But now after watching this, they want to know what ALL the dimensions are. And how many dimensions are there? What is the last dimension? We would love if you could answer some of these questions for us!

Vor 6 years## Michael Jones

Dearth dimension is the key to string theory, for it is uncommon from our perspective.

Vor year## Michael Jones

@Snafu Length, width, depth, duration, dearth, near, far, light, gravity, velocity & space-time = 11 dimensions.

Vor year## Michael Jones

@Trey Rogers All you need is length, width, depth, duration, dearth, near, far, light, gravity, velocity & space-time = 11 dimensions for a simple brain retuning.

Vor year## R Tendo Tapiwa

@mccracra Problem solving learning! 😄👏🏽👏🏽👏🏽👏🏽👏🏽

Vor 2 years## Snafu

Mathematically Trey is correct; however, quantum theory currently (I think; haven't looked for a few years) reckons the 12th diminsion correctly amalgamates string &

Vor 3 years## Caleigh Fisher

Great presentation! Charles Howard Hinton introduced me to 4D thought at 9yo. His insights and toys should have been adopted decades ago

Vor 9 Monate## Florea Ciprian

You cant get nerdier than comparing calculators. I love it

Vor year## Patrick Wallwork

So using just 1’s and 0’s, I just watched a 2D representation of a 3D man showing me the shadow of a 4D cube (or solving a 3D Rubik’s cube). Nice!

Vor 3 years## Sleight 'a fireball

I'm curious. Do you have the source code for the simulations you made to show the higher dimensional objects intercepting 2d and 3d universes?

Vor 4 Monate## ozdergecko

How did I miss this till now? Matt at his very, very, very best!

Vor 6 years## Joseph d'Argy

35:46 I like how he acknowledged the fact that we were _forced_ to draw charts.

Vor year## DerKiesch

The trick about the cubes could be: Each last digit gives a distinct last digit in the cube (0 for example yields a 0 again at the end, 1 yields 1, 2 8 and so on; it's more or less the same last digit as the last digit of the cube of the number. So you either have to remember these digits or remember the cubes from 1 to 9 (which comes in handy for the next part: For the first digits it's probably practical to know in which range you are - 8000 (20^3) to 27.000 (30^3) --> 20s, 27.000 (30^3) to 64.000 (40^3) --> 30s; 64.000 to 125.000 --> 40s and so on. This will give you a good idea about the first digit of the 2 digit number and just relies on knowing cubes of 1-9 (and the adding 3 zeroes). However maybe there is an even easier trick, since he mentions he wouldn't know if you didn't take a non 2 digit number.

Vor year## David Green

I don't even like math yet I ended up spending 1 hour to watch this guy and I don't regret it... The proof that anything can become interesting, even the things you hate, as long as long as the presentation is done by someone who has the gift for teaching.

Vor 4 years## R D

After watching him it would be a hard choice to know whether you like him more or math more . He is good and he makes the subject great. .

Vor 3 years## Emil Macko

This guy has to be the Doctor sometime

Vor 5 years## Pepsi

I understand the show a lot better with him

Vor 4 Monate## Sleight 'a fireball

The doctor and his sonic tesseract Flies around in a klein bottle thats twistier on the inside

Vor 4 Monate## シロダサンダー

More fun to have him be the Master :)

Vor 6 Monate## Michael Mele

Yes! This would be wonderful!

Vor 7 Monate## Ryan Mitcham

YESSSSSS

Vor year## Glitch Walker

This was a very enjoyable video. Thank you.

Vor 2 years## Simon Howroyd

Great talk Matt, very entertaining and well explained! Simon, Aero & Auto Engineering, Loughborough university

Vor 4 years## Jussi Pelkonen

A great lesson! I had the subtitles on (or were they there originally), and at 59:30 the subtitles said "Pöh" in plain Finnish! I have always known mathematics as the universal language, but that it knows Finnish interjection words was a bit of surprise!

Vor 2 years## Max Doubt

Keeping a big room of young kids interested in a math lecture is a laudable accomplishment.

Vor 4 years## Penny O'Flaherty

This has beeen well presented! ! Even a youth would like& learn. I feel I missed out back moons ago through school. We didn’t have internet then. Like many other parts math, our teachers could only stick to the program. It’s only these last years in lockdown I’ve turned back to math through UNSW picking up where I was left struggling in spherical math — sin/ cos / tan etc. going on to your torus re light traveling in straight line, the refraction just like the sunrise the light going out to infinity or is it?

Vor 7 Monate## lillalysmasken3

brilliant. Just playing around with the 2-d version of a 4-d rubics cube made me understand 4 dimenstions atleast 75% better!

Vor 4 years## Lilly Young

Very interesting, I never thought about 3-dimensional objects having a 4D shadow.

Vor 2 years## exeexecutor

its the other way Around

Vor 2 years## John Walton

Enjoy your talks very much. I was wondering if there is a calculation or mathematical model to show how different electrical cables get tangled when placed in a box?

Vor 2 years## nerd Teacher

what a wonderful and engaging talk; thank you.

Vor 6 Monate## Whisky Weasal

Are there any examples of a 4-d object casting a 3d shadow in the natural world that can be experienced?

Vor 3 years## MONITOR-MIND the OVER-VOID

This is my favorite mathematics/physics class so far, I'm a medical student BTW.

Vor year## House X

Enjoyed every second of this!

Vor 2 years## Eric Taylor

I wonder what old Mike Faraday would think of this. Not only is a tradition he started still going more than 160 years later but they can now be seen by nearly anyone, anywhere in the world. Even America! Has the RI done any reenactments of Faraday's original lectures?

Vor 6 years## Shambo Saha

@Eric Taylor Hypatia could've lived longer, but she was brutally murdered. They thought she was a witch because she was good at maths. "Wait, what? How can a woman be a mathematician? What is this, witchcraft? "

Vor 2 years## Charly Taylor

that would be amazing with a good impersonator

Vor 3 years## Steven Attanasso

"Even America" ..... We walked on the Moon 50 yrs ago ....... When are You guys planning on catching up ??

Vor 4 years## Custersword

"Even America!" lol Would love to see reenactments of original lectures

Vor 5 years## Rabbit Piet

Eric Taylor ähm wie bitte was hast du über die Amis gesagt?!

Vor 5 years## M F

i am so impressed that he can solve a cube and talk simultaneously

Vor 3 years## Karl Edmark

Very nicely done, thanks for posting. Was only disappointed with no mention of paradromic rings.

Vor 2 years## Von Doom

The first description of what people called a 4d cube I've understood. My ex pointed at the shadow and told me it was a tesseract, but there was more, then declined further explanation. Your models and explanation make me sleep better, sir. Thank you.

Vor 4 years## MindOverMath

I found you through the suggested videos. Your videos are vey informative! I just made a YouTube Channel due to your inspiration. Keep up the Videos! Just Subbed!

Vor 2 years## BoyCali

I know this was 5 years ago, I'm really late, but I love his attitude he is funny and smart not boring and smart, it makes a big difference. It makes it easier for someone with A.D.D. to learn

Vor 2 years## Anna Franziska

Great, now I got my rubik's cube out again and am trying to decide if it will be easier to translate the instructions of the knitting pattern for my grandma or just knit it myself. The möbius band is one of the first things we did in school in a subject called natural science, basically an introduction to physics, chemistry etc before you know enough maths to teach them separately (I was about 10 years old). And I know that my sister also did that project with a different teacher, but since we went to the same school, I am not sure if it's on the curriculum or just something they liked doing.

Vor 3 years## BadWebDiver

Mobius loops are fun! One of my favorite sci-fi stories was one about explorers on a planet that turned out to be a Mobius Loop. I think it was by Isaac Asminov.

Vor 3 years## Denmart Orlanda

"youre solving a 4D rubiks cube, on a 3D world, on a 2D screen, blowing your 1D mind."

Vor 4 years## Siddharth Rawat

... and your 0D intellect. Coz 0D is a point in cartisian space.

Vor 3 Monate## Awkwardmancer

@Patrick Johnson I mean... mathematically speaking a network consisting of a single point has zero dimensions, so technically you are correct... ¬_¬

Vor 5 Monate## Patrick Johnson

Hey, just because my one brain cell has very small dimensions doesn’t make it one dimensional! I’m offended!

Vor 5 Monate## Inder Chopra

@Eye Heisenberg if you consider all objects to be actually 3D, then the shadow of such 3D objects is purely 2D.... Also one more thing.. If you shine a torch on a piece of paper, do u calculate the "area" of the illuminated part or the "volume" of the illuminated part? As in do u consider the illuminated part as 2D or 3D??

Vor 6 Monate## Salvo Sk

Aimammenuevonoodaa

Vor 7 Monate## H3xon

Ever since I first watched this lecture many years ago. I've tied my shoelaces the mathematical way. I wonder how much time I've saved.

Vor 13 Tage## WildStar2002

Brilliant! Loved it! Matt Parker is awesome! Since I am unfamiliar with the theory of large numbers - I was surprised that someone picked my same number of 89 for the cube root trick and further *astonished* as I work for a company that manufactures iron-nickel meteorite rings *AND* was innocently playing with a Rubik's cube as I watched... :-)

Vor 6 years## Biswayan Bagchi

illuminati confirmed

Vor 4 years## mvmlego1212

Lol, nice.

Vor 6 years## Peter W. Meek

I once wrote a program (in BASIC, no less) that generated stereo pairs of a 4-d cube being rotated in 3 dimensions. I made a sort of stereopticon, with mirrors, that let you view these stereo images in apparent 3-D on the computer screen. Some (most) people found it hard to look at for very long.

Vor year## QuickSkinner

For some reason this talk pops up in the back of my head every few months. I swear i have watched this talk maybe 20 times in its entirety.

Vor 3 years## Julia Christina Heikamp

My first OWN calculator was from Texas Instruments. I loved it, the newest model, just out. It was blue, not grey, and already solar-powered. All the other kids in my class were jealous. My Dad had loads of calculators, and yet, he bought me a new one, because he said: Everyone who wants to be serious wth numbers and math needs his own personal calculator. I think there is something to it, like the wand that chooses it's master, not the other way around.

Vor year## Warron French

Phenomenal, very fun to watch.

Vor 2 years## The Royal Institution

Thanks to our incredible army of volunteer transcribers, we now have English captions for Matt! Thank you so much for everyone who contributed and helped make this video more accessible.

Vor 5 years## Felix Roux

@Hugh Danielson That's the whole point of transcribing.

Vor year## Jere Lull

And thanks from we who don't hear as good as we once did.

Vor year## zoklev

@Hugh Danielson captions can be in the same language a the video

Vor 2 years## Mike Williams

I think be pronounces words as centre, not center ;-)

Vor 2 years## Hugh Danielson

Isn't he already speaking English? If not I think I may have misunderstood the whole lecture.

Vor 2 years## Jellywhale Aspinall

I'm so grateful for a mathematically superior method for tying my shoelaces!!! Best part so far!

Vor 4 years## Adel Ghaenian

That was mind blowing, awesome man.

Vor 3 years## souffleagent

I can't remember when I was so excited about a knitting pattern

Vor year## Peter

It's funny to hear Matt talk about giving things a go a whole year before the Parker Square became famous.

Vor 2 years## Michael Hartman

Thank you for a most enjoyable math lecture.

Vor 7 years## Paul Thompson

That's right. "math"

Vor 5 years## Johan Kotze

I enjoyed this immensely. Years ago I worked for the Reader's Digest. One of the books they published was "Things To Make And Do" Some wise allec added "...when you are in the loo"

Vor 2 years## vidyaWolf

The shadow thing was a total revelation for me. Also how to tie your shoelaces mathemagically.

Vor 3 years## _

really a great presentation - thanks

Vor 2 years## Moto Peter

Can you grab a 4D cube? Can you turn it around? If so, you can prove whether an item is 4D and you can understand its shape.

Vor 2 years## Pero Juric

This show was so good. I enjoyed every minute.

Vor 5 years## Peter

Matt Parker always sounds very enthusiastic and spontaneous in all his speeches, and this makes it very fun to listen to him.

Vor 5 years## kd1s

You know it occurred to me - calling them glasses is a misnomer. They're pretty much polycarbonate or other exotic plastics these days. And the 2 digit number thing - I brought up a spreadsheet - used 10 through 99 - cubed them and then divided by 9 That's when the pattern emerges.

Vor 4 years## Croc Clark

i have always been fascinated by the Bell Curve. I believe it is 3 dimensional, not 2 dimensional.

Vor 2 years## Smallhead

Can we all just take a moment to appreciate that his name is literally Math?

Vor 2 years## TriptoPal

Matt Parker is awesome teacher.

Vor 2 years## sabrina felber

I would have stayed awake if math was taught like this and learned so much! Come on teachers! Take a lesson from from this man! I wonder how he make makes numbers fun?

Vor year## Trackpad

I know we're all keen to make jokes about this stuff, but genuinely, I don't think I've ever seen a video that so clearly and so concisely explains how higher-dimensional geometry works.

Vor 11 Monate## Peter

I simply imagine the 4th dimension as several 3D spaces that exist in the same space - kind of like how several 2D planes can exist in the same region if you look at them from above. So if you for example wanted to walk through a door then you could enter another 3D space, then walk the necessary distance forward, then go back to this space again. You could imagine that you start at the coordinates (0,0,0,0), then in the other 3D space you are at (0,0,0,1), then when you walk forward you get to (0,0,1,1) and then finally you come back to this space again and end up at the (0,0,1,0). You can even kind of visualise the _direction_ of the 4th dimension if you think about it this way, because all 3D coordinates can be considered perpendicular to any of the other 3D spaces.

Vor 3 years## Terry Zúñiga

This guy's life must be awesome. Look how he brightens peoples minds in such a fun way.

Vor 4 years## ThePyromancer13

Do string theorists hate knot theorists.

Vor 6 years## Ronin

😆 🤣 😂

Vor 28 Tage## müd

Only when faced with quantum entanglement heh Well, someone beat me to it... I don't really understand any of the three anyway, more of a fingerprinting while snacking on the paint kinda guy

Vor 2 Monate## Ad amp

No cause really whether it's strings loops or knots. It can still describe the same thing

Vor 2 Monate## Awkwardmancer

They do knot...

Vor 7 Monate## Tucker Gary

they both think quantum physicists are wierd.

Vor 8 Monate