4th Dimension - Fourth Dimension - 4th Dimension Explained - The Fourth Dimension- The 4th Dimension

This video explains the 4th dimension. Here you will know, how is the 4 dimensional world and how to visualize the fourth dimension. Powers of 4th dimensional being are covered in the video. After watching the video you will understand the 4 dimensional objects like Tesseract (4D Hypercube).
A 4 dimensional being can easily take out objects kept inside a 3 dimensional closed box without opening or breaking it.
He can remove the object through the 4th dimension and a 3D being like us would wonder, where the object has gone?
Actually one extra dimension- the 4th dimension, is available to the 4D being to interact with the object. Beings of 3rd dimensions can't see or perceive that fourth dimension.
For 3D humans like us, that object would simply seem to disappear from the box.

As we know that 2 dimensional structures like a square, triangle or circle cannot bound 3D beings like us.
We would easily escape from the 3rd dimension that is perpendicular to the plane of these 2D shapes.

You will be surprised to know that the fourth dimensional beings cannot be bounded by 3 dimensional structures like closed box or cage. They would escape through the 4th dimension without opening or breaking the box.
So we 3D humans cannot imprison the 4 dimensional beings.

Now we will visualize the fourth dimension using the method of cross section of objects.

If a 3 dimensional object passes through the 2 dimensional plane, the beings living in the 2nd dimension would only see the cross section of the 3D object cut by that 2D plane.
Because a person living in two dimensional world can only see the objects that are present in its 2D plane. It is not possible for him to see anything which is above or below its two dimensional plane.

Do you know that a two dimensional beings would have one dimensional retina in their eyes, so they would not see the apple as a growing circle.
Actually one dimensional projection of the circle would be projected on their one dimensional retina.
We are three dimensional beings and we have two dimensional retina.
On this two dimensional retina, 2D images of 3D objects are formed.
This is actually the two dimensional projection of the 3D objects.
But our brain is smart enough to create a 3D model of the object from this 2D projection on our 2 dimensional retina.
The brain gathers 2 dimensional information like lightening, shadow gradient and perspective from our eyes. Then after processing it, the brain creates an image with depth.

Therefore we can not see 3D objects in their entirety as we only get 2D projection of the 3D objects on our 2 dimensional retina.

For example, if there is a opaque closed box, we cannot see what's inside it. It's also not possible for 3D beings like us to see all the surfaces of the box simultaneously.
To see the box in its entirety, we need to see it from different angles separately.

But we can see a two dimensional object in its entirety because of our 2D retina.
For example we can see a rectangle in its entirety, it's all sides and also it's complete inner area at the same time.

In the same way, a 4 dimensional being would be able to see a 3 dimensional object in its entirety.
It would be possible for him because of his 3D retina. The entire 3D projection of the 3D object would be formed on their 3D retina.
So a being of 4th dimension would be able to see all the surfaces of the solid objects simultaneously. He would easily see what's present inside a closed box or what's happening on the other side of the wall.
It would be possible for him to see all the internal organs of your body and many other incredible things like this.

But the 4 dimensional beings would not be able to see the four dimensional objects in its entirety as they don't have 4D retina. So only 3D projection of the 4D object would be formed on their 3D retina.

Friends, There is one more way that can be used to visualize the 4 dimensional world. This method is called the bounding volumes.

As we know that 2 dimensional objects are bounded by one-dimensional boundaries.
In the same way three dimensional objects are bounded by two dimensional surfaces.
So by applying the dimensional analogy we may infer that a four dimensional object is bounded by three-dimensional volumes.

It has also been proved by mathematics that a 4 dimensional structure known as the Tesseract is bounded by 3 dimensional cubes.
Actually tesseract is the four dimensional analogue of the cube which is also called as the hypercube or the 4D cube.
It is considered as one of the simplest 4D shape.

The 4 dimensional being would be able to move freely in time dimension; in the past or in future.
That being would also be able to go back in time and change his decisions and start a new timeline.
But as no parallel universes exist in the 4th dimension, he would be able to have only single timeline. Therefore his old timeline will end and new timeline will start based on his changed decision.

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