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

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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.
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.
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?

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
If we lived in a 1d universe, the 1d universe couldn't curl up on itself.
kenny levin
Albino talks too nuch

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
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
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

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.
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
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
The UnReaL Graffiti
may sound dumb...but how did the square contain the same number of points
as its side???
martijn van weele
if you curl up a line it automatically becomes at least two-dimensional,
your argument is invalid.
dangerous goose
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?
Jarred Mack
This video proposed a question but didn't answer it and proceeded to
introduce more questions.
Andrew Luo
Make a video about the 4th dimension :)
Am i still the only one who has discovered how to actually see a tesseract
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?
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
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