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@STARGÅTE :

You are right, extrusion in Z is not right everything... Thus 3D is already cube and i only extrude the time (line as 1D) over cube, it makes more that this :



It looks like more to terrasect !

Dear threedslider,

you mix up different topic: dimension itself, dimension of objects in different dimensions, and the projection (image) of n-dimensional objects into a view.

Dimension itself:
A 4-dimensional (4D) space is a space were you have 4 linearly independent axis.
The easiest definition would be (x,y,z,w) with the base (1,0,0,0), (0,1,0,0), (0,0,1,0) and (0,0,0,1).
Such space is also euclidean, because euclidean is not limited to 3D [see Euclidean space].
They have normal distances like sqrt(x^2+y^2+z^2+w^2) etc.
Only in such a 4D space you can add objects with 0, 1, 2, 3 or 4 dimensions.

Dimension of objects:
An n-dimensional object is an object in n or more dimension with an expansion in n directions. You can not "create" 4D in a program with just three dimensions, what ever you try. You can only create a projection (see below).

The projection of objects:
The projection of a 4D space into a 2D space needs a 2×4-matrix, because you want to transform (x,y,z,w) to (x',y'). Such matrix could be very easy, and you did this in basic school already. You draw x and y into x' and y' of your view, and make z diagonal. The same can be done for the 4th dimension and so on. But all are just projections. You can not imaging a four dimensional object itself, only the projection in 2D or 3D.

In summary:
The tesseract (your last picture) is probably the most common way to project the 4D cube into the 3D world and render it on the 2D screen.

STARGÅTE wrote: Sat Jan 03, 2026 5:48 pm
In summary:
The tesseract (your last picture) is probably the most common way to project the 4D cube into the 3D world and render it on the 2D screen.

@STARGÅTE. Fully agree with you. The rest is into the field of 'metaphysic' i think.

@Threeslider. But what is the point of this?, i think the point of 4D in our day by day is time/space, no more, With design, simulations, etc.

I think that only if you are a theoretical physicist can you find some use for it (excuses to support theories that cannot be proven ). But in that case 'Sheldon Cooper' surely has the answer.

For visual effects is nice too. Imagine a Discoteca with big effects in the walls with hipercubes and tesseracts running with first cup for free and happy hour too!

Yeah maybe

But my original 4D, the extrusion is a face outside pointed but if i resize in inside the cube we have the same a terrasect ! Got it ?

Your base in 4D is interesting (1,0,0,0) (0,1,0,0) (0,0,1,0) (0,0,0,1) but dunno if it works like that because of 4th axis is a strange as extra dimension...

That is work for 4D matrix ??

the w axis needs to give me more information

If we agreed that we see the terrasect a cube inside the cube, something it looks like a cycles of in/out, a cube is a 3D space however a 4D the representation is two cube which the transformation is merged by time, it means to 3D space inside to 3D space...

In summary:
The tesseract (your last picture) is probably the most common way to project the 4D cube into the 3D world and render it on the 2D screen.
Imagine to 4D as double 3D space inside each other and ... to render in 2D is quite impossible for me !!! because the time extra dimension is a "ghost"

I think for 4D more like to this mocking by Jean Pierre Petit : https://unilater.com/fr/ ... See you by yourself

minimy wrote: Sat Jan 03, 2026 6:34 pm

STARGÅTE wrote: Sat Jan 03, 2026 5:48 pm
In summary:
The tesseract (your last picture) is probably the most common way to project the 4D cube into the 3D world and render it on the 2D screen.

@STARGÅTE. Fully agree with you. The rest is into the field of 'metaphysic' i think.

@Threeslider. But what is the point of this?, i think the point of 4D in our day by day is time/space, no more, With design, simulations, etc.

I think that only if you are a theoretical physicist can you find some use for it (excuses to support theories that cannot be proven ). But in that case 'Sheldon Cooper' surely has the answer.

For visual effects is nice too. Imagine a Discoteca with big effects in the walls with hipercubes and tesseracts running with first cup for free and happy hour too!

I proved my original 4D is more like terrasect, to resize it is same in or outside, try yourself in Blender

As i give you a link from Jean Pierre Petit, I think the 4D is more like something this, something the 4D is a in/out that reverse in direction

Real 4D on a 2D view:
but the rotten apple have to be the same place as the left apple currently its 2 different apples.

How about moving in 5D is to move between different planes of reality; when you do a 5D rotation (or something of that sort), the James Bond girl has no more braces in our perspective of reality. But somewhere on a parallel plane the opposite is true: they see a girl with braces where there wasn't one before. Could that be how the 'Mandela effect' works mechanically? Perhaps the trick works with simple 3D/4D analogically to lemon ink and other "magic" inks but that would have to be done already during production. Some people claim that there are much deeper changes than visuals and word spellings, like entire continents missing on a map - but they are extremely rare compared to the bond girl and jungle book "witnesses".

Well for 5D ... It is more complicate than this because for example for 4D there is 3D + 1D(time) it is same for 3d except it change with time in all direction, now for 5D there is 3D + 2D (time + location) ! So what does it mean ?? I think it is same as 4D but adding more to location with time... difficult to explain it ?

So nobody has a topology for 5D from now

For 6D well you know is 3D + 3D it is one of the most profound from reality

And 7D, another a complete of change for reality !!

And so on...

minimy wrote: Sat Jan 03, 2026 12:42 pm 4D is relative to time and space.
Like this:

Ok but for me 4D is multiverse after you have showed this picture... A box (T=0) and another box (T=1) and then another (T=2) and so on... that shows the time, the universe is separated by other universe... What do you think of that ?