Understanding Dimensions and the Fourth Dimension

Imagine that this folder is a dimensional plane.

Now, assuming that it has no height and no depth, what would this mean?

It would mean that it's a one-dimensional world.

So if, hypothetically, an organism was living inside of it, it would only be

able to move in a linear path forward and backwards in a straight line.

Now,

if we go to the second dimension, we have two dimensions.

We have width, and we have length. So hypothetically, if an organism lived

inside of here, then it would be able to move up, down,

left, right, and

anywhere else in between.

And a two-dimensional world is comprised of an infinite

series of one-dimensional worlds stacked upon each other.

Just as our three-dimensional world, which has depth

and length and height,

is comprised of an infinite series of two-dimensional worlds.

So this-- Now that I have stacked many folders upon

each other,

we have three dimensions. We have depth, we have length, and we have width.

Now, what happens if you keep going on from

here on out?

We would have a four-dimensional world. But what exactly is a fourth dimension?

In order to understand this, we need to understand how dimensions

are perceived.

We live in the three-dimensional world, but despite that, we actually view

things to be two-dimensionally. Take a perfect sphere, for

example. If you're looking at a sphere, it looks just like a regular

two-dimensional circle. The only way that you could tell it's just an actual

sphere

instead of a circle is because of the hues of light on it.

So just like in a two-dimensional world, if a, um,

organism in the two-dimensional world was looking upon a circle, it would-- the

light would make it appear to be lighter at one end and darker at

the middle.

Also, if you-- if an object is moving farther-- closer

and farther away

from you, you don't actually perceive that it's getting closer and farther away.

You see that it's getting smaller or larger, and then you assume that it's

getting either farther away or closer.

But let's say if an object was to grow in perfectly

equilibrium so that it was growing at the same speed

that it was shrinking as you move it farther away, then you would not be able

to tell without any lights or, uh, if there were details on the

object that it's moving or growing at all.

You may have assumed that since we perceive things to be in two

dimensions, that

a two-dimensional o- uh, organism would see in one dimension.

So as we're watching this, uh, rubber band expand,

as it moves farther away from this little, uh, organism in the

two-dimensional world, it's-- does not actually perceive anything is

happening to it because it's growing at the same speed that it's moving farther

away. But since we can actually see it from the

three-dimensional world and

perceive things to be in two dimensions, we can see things

for how they actually are.

The reason that the two-dimensional organism doesn't see things the way they

really

are is because the two-dimensional organism sees things in one dimension,

just how

we three-dimensional creatures see things in two dimensions.

So in a way, we don't really see our world the way it

truly is.

A four-dimensional creature, however, seeing our three-dimensional world in

three

dimensions, would be able to see through things.

It would be able to see absolutely everything, just as we could see if

there was, uh, several organisms spread along a

twoD, um, environment on your floor.

You would be able to see inside houses. You would be able to see inside of people.

So if a two-dimensional world, a flat surface,

is just made of an infinite

amount of, uh, lines, then the

3D world is just made out of an infinite amount of planes.

So the fourD world, logically, is made out of an infinite amount

of 3D objects, though they're not just put

together like, um, you would-- like building blocks.

N- That's not how the fourD world is.

That would just be 3D again. So in order to understand

this, we need to understand the logical

progression

of mathematics in our world.

Imagine that this K'Nex piece represents the first dimension.

It's simply a straight line, which is basically what the first dimension

looks

like. And if you add three

more of these straight lines and connect them to--

so that adjacent sides are perpendicular and

opposite sides are parallel, then you have the basic shape of the

second

dimension. You have a square. Now, if you keep going from here,

and you add four-- add it so that there's a total of four squares,

and all adjacent sides are perpendicular and all opposite

sides are parallel, then you end up with,

obviously,

a cube.

So if you try to keep going from here, and you would have a

four-dimensional basic shape, you would have a, what's called

a tesseract. Now, I cannot show you a

tesseract, but you need to understand that it's basically four

cubes that are within each other that, um, have all

adjacent sides perpendicular and all per--

and all opposite sides parallel, yet there are three

lines connect-- uh, four lines connecting to each vertex.

So a v-- tesseract would look somewhat like this

picture. Now, that-that's not exactly what it looks like

because this is a

two-dimensional depiction, and obviously, not all of the lines are

straight. So I cannot show you what a tesseract

actually looks like because we cannot perceive things in the third dimension.

You cannot even imagine what a tesseract looks like.

You cannot physically-- You cannot in your mind picture the

fourth dimension or a fourth-dimensional shape.

And you can keep going on from the fourth dimension even.

You can go to the fifth dimension, the sixth dimension, the seventy-first

dimension. It doesn't matter. Theoretically, there

are an infinite amount

of spatial dimensions. The common misconception of the fourth

dimension is

that the fourth dimension is time.

Now, while some argue that go— by going forward and

backwards in time, if you move forward the same distance

and backwards the

same, then you would end up in the same place

you started, just like in

the fourth dimension. And while that may seem logical,

if you think about it, it

really doesn't make sense. If you imply that the fourth dimension is

actually time, well, first of all, time is not spatial.

There's a difference between space and time, quite obviously.

And assuming that all dimensions are according to a

pattern, then that doesn't really make sense

either, because

saying the fourth dimension is time,

every dimension has time in it. So that would mean that

the fourth dimension is special in some way,

which doesn't really make any sense.

Another reason this doesn't make sense is that we sl-- very, very,

very slightly travel through time whenever we move

due to the distance, um, that light takes to get to our body.

Now, if a group of astronauts were to get in a spaceship and they

were to go

very, very, very close to the speed of light,

then they would--

and they, they went around in this, um, impossible,

nearly the speed of light spaceship for a few months, and then afterwards they

returned to Earth, they would find that Earth had actually progressed a few

years,

so they had moved forward in time by moving that quickly.

Another interesting concept involving the fourth dimension is that many

physicists and even mathematicians, uh, may say that the

dimensions are very, very slightly curved because if you

really think about it, nothing can be truly, absolutely infinite.

So imagine that a-- the first dimension, the line,

is just very, very slightly curved so that after a very long

time, it will, um, end up creating a circle.

So, um, as suggested by many physicists, if you keep going in the

same direction, then you will end up where you are,

where you

started after a very, very long amount of time, obviously.

And the same thing would happen to the second dimension.

If it's just a square, and then you extend it very, very

slightly in a curve, then it will eventually make a sphere.

And the same thing happens in our dimension, except it will form a very,

very slightly curved, um,

third dimension, which will form a four-dimensional

universe,

basically.

So what this kind of means is that our three-dimensional world is

within a four-dimensional world, and the four-dimensional world is within

a fifth-dimensional world, and so on.

Now, I did say that nothing can be truly

infinite, but if this is true

and a dimension is really within another dimension, within another dimension,

within another dimension, then I'm implying

that there's an infinite amount

of dimensions, which is the only problem I really have with

this theory.

I'm not sure if it ever stops or if

infinite-- infinity is really even possible.

We don't know that.

Thanks for watching my video, and I hope this gave you a better idea of

what the

fourth dimension is.