# Movie: What is a dimension? In 3D...and 2D... and 1D

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## Comments

Michael Bomsdorf

How do we know we live in 3 dimensions?

martijn van weele

if you curl up a line it automatically becomes at least two-dimensional,

your argument is invalid.

your argument is invalid.

3snoW

Space filling curves aren't at all what you are saying. If you truly fill

space (be it 2-D or 3-D) using only a 1D line, then for any points A and B

in the curve, if you were to follow the line from A to B, you'd travel an

infinite distance. So, it's not like we could use only one coordinate that

would tell you the position in the line (and therefore in the space) you

are at, all the points are infinitely distant from one another so there is

no metric. You NEED more dimensions to fully describe the space.

What you CAN argue is that you can do an approximation of a space filling

curve. A 1-D line that does not pass through every point in space, but that

passes nearby every point in space. And by nearby i mean that the shortest

distance from any point in space to that line is always smaller than the

Planck's length. Then, you *could* argue that you can describe 3-D space

using only one coordinate, because any distance smaller than the Plank's

length doesn't make much sense, and therefore, as far as your calculations

are concerned, the line does pass through every point in space, and is

1-D.

space (be it 2-D or 3-D) using only a 1D line, then for any points A and B

in the curve, if you were to follow the line from A to B, you'd travel an

infinite distance. So, it's not like we could use only one coordinate that

would tell you the position in the line (and therefore in the space) you

are at, all the points are infinitely distant from one another so there is

no metric. You NEED more dimensions to fully describe the space.

What you CAN argue is that you can do an approximation of a space filling

curve. A 1-D line that does not pass through every point in space, but that

passes nearby every point in space. And by nearby i mean that the shortest

distance from any point in space to that line is always smaller than the

Planck's length. Then, you *could* argue that you can describe 3-D space

using only one coordinate, because any distance smaller than the Plank's

length doesn't make much sense, and therefore, as far as your calculations

are concerned, the line does pass through every point in space, and is

1-D.

cuddlepartyatmyhouse

If it was one dimensional but curled like yarn. A thing would have to

travel all the way around the universe on that line until it ended up on

the line next to it. Therefore a photon would take many times the age of

the universe to move to an adjacent "tread".

travel all the way around the universe on that line until it ended up on

the line next to it. Therefore a photon would take many times the age of

the universe to move to an adjacent "tread".

TheMrFloorball

if we could define our world a 1D line, we have to pass the following point

on the line before reaching another point, we couldn't go directly there

on the line before reaching another point, we couldn't go directly there

thesunandthestripes

Am i still the only one who has discovered how to actually see a tesseract

hahah

hahah

Sarah Kettell

*What is a Dimension and Do We Actually Live in a 1D World?*

This is probably one of the most interesting and intelligent discussions

I've ever read in YouTube comments. The video itself is good enough, but

the comments make you think.

This is probably one of the most interesting and intelligent discussions

I've ever read in YouTube comments. The video itself is good enough, but

the comments make you think.

Animiles

I want my room to be 11x3x3x5m. How would that look? If it is 11x3, then it

is flat.

Another thing, if the line is in all directions, then the line is 3d,

right?

is flat.

Another thing, if the line is in all directions, then the line is 3d,

right?

SparkySywer

If we lived in a 1d universe, the 1d universe couldn't curl up on itself.

Stefano Cipollone

You sound a bit unenthusiastic, hope everything is well.

Andrew Luo

Make a video about the 4th dimension :)

Henry Reich

In case you haven't seen it yet... how many dimensions do we really live

in?

in?

Henry Reich

1D! it's the new 3D! (and we might live in it)

Stijn Dijkstra

what if back in time(if time exists O.o), humans started thinking in more

than 3 dimensions? is it excally the world that is in 3 dimensions, or our

mind that thinks there are 3 dimensions?

than 3 dimensions? is it excally the world that is in 3 dimensions, or our

mind that thinks there are 3 dimensions?

Dave Cole

Physics, never looked so good.

SuperEclipse24

And 0D is the dot

Carlos Shelton

I associate this with Fundamentalism: What is a dimension? In 3D...and

2D... and 1D: http://youtu.be/SJJhHknEDPY

I will explain more tomorrow.

2D... and 1D: http://youtu.be/SJJhHknEDPY

I will explain more tomorrow.

Emmanuel Lescouflair

I still haven't learned what a dimension is. I guess I'll continue my

search elsewhere.

search elsewhere.

Dennis Liu

Really Henry, you are LESS... MUCH Less excited or sounds excited, at

least, than before... I wish I can have the old henry back =(

least, than before... I wish I can have the old henry back =(

Nicholas Meyer

Clever

Saleh S.Kathery

Tell me what do you think guys?

Bava Neche

In Creation -- A singularity of Nothingness and is the "1st Dimension". The

moment "Anything" is created in that Nothingness it becomes an automatic

accumulation of the Geometric Configurations X, Y, and Zed, called 2nd, 3rd

and 4th Dimensions. Moving beyond those 4 Dimensions automatically creates

Time which is an accumulation of dimensions which are "Direction", Distance

and Speed which is the 5th, 6th and 7th Dimensions. The Next Dimension is

made up of another accumulation of dimensions is 8th Dimension of Mass, 9th

of Ampliflication and the 10th of Frequency. The 11th Dimension is the

Matrix that holds it all together.

moment "Anything" is created in that Nothingness it becomes an automatic

accumulation of the Geometric Configurations X, Y, and Zed, called 2nd, 3rd

and 4th Dimensions. Moving beyond those 4 Dimensions automatically creates

Time which is an accumulation of dimensions which are "Direction", Distance

and Speed which is the 5th, 6th and 7th Dimensions. The Next Dimension is

made up of another accumulation of dimensions is 8th Dimension of Mass, 9th

of Ampliflication and the 10th of Frequency. The 11th Dimension is the

Matrix that holds it all together.

john michael

dont get it...why cant u draw a curled line thro all the hot air atoms

Jesse Nichols

+Ryan Chesley More support for everyone being one with the salt-shaker.

toshineon

This reminds me of an arguement I had with a friend a long time ago. 3D

movies (the crappy kind with the red and blue glasses) were all the rage

where I live at the time. My friend asked why you call a game on

PlayStation 3D when it isn't actually. I tried to explain that the games

image is rendered in 3D, but since the television set can't output a 3D

image, the picture itself is 2D. We would talk about this for hours on end,

never settling the argument... Ah, good times.

movies (the crappy kind with the red and blue glasses) were all the rage

where I live at the time. My friend asked why you call a game on

PlayStation 3D when it isn't actually. I tried to explain that the games

image is rendered in 3D, but since the television set can't output a 3D

image, the picture itself is 2D. We would talk about this for hours on end,

never settling the argument... Ah, good times.

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