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

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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.
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
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".
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
Am i still the only one who has discovered how to actually see a tesseract
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.
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,
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
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?
Dave Cole
Physics, never looked so good.
And 0D is the dot
Carlos Shelton
I associate this with Fundamentalism: What is a dimension? In 3D...and
2D... and 1D:

I will explain more tomorrow.
Emmanuel Lescouflair
I still haven't learned what a dimension is. I guess I'll continue my
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 =(
Nicholas Meyer
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.
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.
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.
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