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

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## Comments

Bruce Key

At some point in the future, all human life will cease to exist, and the

earth will be completely gone, and all the science ever discovered from the

beginning of human existence... will be utterly and completely meaningless.

earth will be completely gone, and all the science ever discovered from the

beginning of human existence... will be utterly and completely meaningless.

Albino173

To all the people in the comments that are confused about how we can only

be in a 1D world curled up to look 3D but it may as well be curled up into

2D, or how we can traverse this 3D world so many different ways instead of

being constrained to a 1D path. This video explains dimensions WRONG. A 1D

world cannot curl up on itself in if there is only 1 direction to move

along. A string would not bend if it was constrained to one direction of

motion. Multiple dimensions are constituted of multiple orthogonal

direction vectors. This means that each measurement of spacial direction

must be 90 degrees from each other so that neither one involves another. If

we are all living on a 1D line of space that is curled up then, A) There

must be 3 dimensional directions available in space for the line to curl up

though. or B) There must be multiple 1D lines connected all points along

our 1D line so that we can take free form paths to get from one point to

another instead of being constrained in every potential motion.

be in a 1D world curled up to look 3D but it may as well be curled up into

2D, or how we can traverse this 3D world so many different ways instead of

being constrained to a 1D path. This video explains dimensions WRONG. A 1D

world cannot curl up on itself in if there is only 1 direction to move

along. A string would not bend if it was constrained to one direction of

motion. Multiple dimensions are constituted of multiple orthogonal

direction vectors. This means that each measurement of spacial direction

must be 90 degrees from each other so that neither one involves another. If

we are all living on a 1D line of space that is curled up then, A) There

must be 3 dimensional directions available in space for the line to curl up

though. or B) There must be multiple 1D lines connected all points along

our 1D line so that we can take free form paths to get from one point to

another instead of being constrained in every potential motion.

Dave Sheik

Qui a fait les sous titres français ? C'est dégueu sérieux !

B Sto

Does anybody know the dimensions of taste or smell?

Maro rose

how can a 1D thing curl? It only has on dimension?

WELL MINUTE PHYSICS MAKE A VIDEO ABOUT THAT!

WELL MINUTE PHYSICS MAKE A VIDEO ABOUT THAT!

Anna Kristín Halldórsdóttir

You know what. I would love it if you made extra videos with the math and

more in depth explanations. I wouldn't watch all of them, but a lot.

Because I feel like your videos are almost just like trailers that make me

want to know more! I for example understand what you said about the gas but

I don't understand how that proofs that we live in 3D... wouldn't it look

like that aswell if we were in a curled up 2D world?

That being said. I absolutely love your videos. Keep up the good work! :D

more in depth explanations. I wouldn't watch all of them, but a lot.

Because I feel like your videos are almost just like trailers that make me

want to know more! I for example understand what you said about the gas but

I don't understand how that proofs that we live in 3D... wouldn't it look

like that aswell if we were in a curled up 2D world?

That being said. I absolutely love your videos. Keep up the good work! :D

SparkySywer

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

kenny levin

Albino talks too nuch

Unknown

Stefano Cipollone

You sound a bit unenthusiastic, hope everything is well.

Den mark

I don't understand everything he said

but I know 1D sucks

but I know 1D sucks

Vinayak ns

If you lived in a 2d world how would you know 3 dimensions existed? Is it

possible that there are more than 3 but we cannot see/know/figure more than

3?

possible that there are more than 3 but we cannot see/know/figure more than

3?

le Coops

I hope we don't live in 1D, their music sucks :P

Jake Hayward

If we lived in a 1-dimensional universe that looked 3d, how could we travel

from one point to another in so many different ways? Wouldn't we be forced

to take one route because it's only a 1-dimensional line? Could someone

explain?

The only explanation I can currently think of, is that there are an

infinite amount of 1-dimensional dimensions to connect each point together

to give the illusion of a 3-dimensional universe. I'm going to spend

several weeks looking into this.

from one point to another in so many different ways? Wouldn't we be forced

to take one route because it's only a 1-dimensional line? Could someone

explain?

The only explanation I can currently think of, is that there are an

infinite amount of 1-dimensional dimensions to connect each point together

to give the illusion of a 3-dimensional universe. I'm going to spend

several weeks looking into this.

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

Maro rose

do you mean time as in the fourth dimension or time in the fourth and more

because there is no differents between space and time they are just

labels.

because there is no differents between space and time they are just

labels.

The UnReaL Graffiti

may sound dumb...but how did the square contain the same number of points

as its side???

as its side???

martijn van weele

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

your argument is invalid.

your argument is invalid.

dangerous goose

future

Abe Dillon

What if there are dimensions we can't directly measure? Imagine you're on a

space craft that has rockets to move up and down and rockets to move left

and right, but no rockets to move forward and backward. You may be moving

forward at some speed, but you can't change our speed in that direction.

You can only measure the effects of moving in that direction (like noticing

that things moving slower than you, pass you by or that stars in front of

you seem more blue than stars behind you). Now imagine that nothing, not

even particles have a way to effect their forward/backward velocity. A gas

on your ship would spread out in a 2D disk.

This seems to me to be the case, because light doesn't move through time

and is the primary force carrying particle. Therefore, other particles

can't change each other's velocity through time if all their interactions

are mediated by photons.

Am I missing something? Is this an accurate interpretation?

space craft that has rockets to move up and down and rockets to move left

and right, but no rockets to move forward and backward. You may be moving

forward at some speed, but you can't change our speed in that direction.

You can only measure the effects of moving in that direction (like noticing

that things moving slower than you, pass you by or that stars in front of

you seem more blue than stars behind you). Now imagine that nothing, not

even particles have a way to effect their forward/backward velocity. A gas

on your ship would spread out in a 2D disk.

This seems to me to be the case, because light doesn't move through time

and is the primary force carrying particle. Therefore, other particles

can't change each other's velocity through time if all their interactions

are mediated by photons.

Am I missing something? Is this an accurate interpretation?

Jarred Mack

This video proposed a question but didn't answer it and proceeded to

introduce more questions.

introduce more questions.

Andrew Luo

Make a video about the 4th dimension :)

thesunandthestripes

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

hahah

hahah

Archit Bajaj

.

Tardi Grade X-tra

One direction is also known as 1D! Oh wait! 1D IS One direction! Are the 1D

guys scientist? How did they know that?

guys scientist? How did they know that?

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.

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