why we cannot exist in 4D plane.

I heard about odd things, like people believing our world could be 4D, but we see in 3D. (and no, the fourth coordinate is not time).

Here is why I don't think that's true.

Imagine a hypothetical creature that sees only in 2D but lives in a 3D world. (and can move only forward and backward and up and down)

If a hypothetical creature exists in 3D, it must be 3D, which means it can be affected by 3D forces like wind. and will change the z-axis of that creature. Even microscopic change will completely change vision in that creature. So if we existed in a 4D world, we would see weird anomalies all the time because of 4D forces affecting us. We would be suddenly in a completely different place. and probably the world would be a completely different place.

@Damkiller25 said in #1:

I heard about odd things, like people believing our world could be 4D, but we see in 3D. (and no, the fourth coordinate is not time).

Here is why I don't think that's true.

Imagine a hypothetical creature that sees only in 2D but lives in a 3D world. (and can move only forward and backward and up and down)

If a hypothetical creature exists in 3D, it must be 3D, which means it can be affected by 3D forces like wind. and will change the z-axis of that creature. Even microscopic change will completely change vision in that creature. So if we existed in a 4D world, we would see weird anomalies all the time because of 4D forces affecting us. We would be suddenly in a completely different place. and probably the world would be a completely different place.
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That’s a really thoughtful argument...... your basically saying that if we lived in a 4D spatial world, we’d constantly experience strange, unexplainable phenomena because 4D forces would affect us in ways we couldn't understand or predict, — similar to how a 2D creature in a 3D world would get disoriented if forces acted along the third dimension (z-axis).

amd plus

2D Analogy: a 2D creature living on a flat plane would only perceive two dimensions. if you lifted it off the plane (introducing a z-axis movement), it would vanish from the perspective of any other 2D beings. If it were then dropped back down, it might appear to have "teleported" or changed shape because the 3D manipulation wouldn't make sense in 2D terms.

applying It to 4D: If we lived in a 4D spatial world, you'd expect similar things to happen:

A 4D force could "lift" us into the fourth spatial dimension, making us disappear from the 3D world.
We might suddenly reappear somewhere else or in a different orientation.
our bodies could be warped or twisted in ways that are physically impossible in 3D space.
objects could appear and disappear or change shape without any logical explanation.
Why We Don’t See That: Since none of these strange events seem to happen, it suggests that we aren't directly interacting with a fourth spatial dimension. If a 4D force were acting on us, it would likely create observable chaos — not just subtle effects but dramatic and noticeable disruptions.

Counterarguments: Some people who believe in higher dimensions suggest that the fourth dimension might be "compactified" or "curled up" at a microscopic scale (like in string theory). In that case, 4D forces wouldn’t act on us in a noticeable way because the fourth dimension might be inaccessible at the macroscopic level.

yea sooooo, thats why most scientists think we live in a 3D world. cuz if we were actually in a 4D world, we’d notice it — like weird stuff happening all the time, not just a theory

@schwasd
fourth dimension might be "compactified" or "curled up"
What this means?
Like if was more compactified wouldn't it be more extreme, and extremely sensive for any force?
Maybe you can explain in more details

maybe we are seeing stuff that really should not be in the 3rd dimension anyway, but we 'perceive' it as being normal because we're conditioned to believing it is.

@Damkiller25 said in #3:

@schwasd
fourth dimension might be "compactified" or "curled up"
What this means?
Like if was more compactified wouldn't it be more extreme, and extremely sensive for any force?
Maybe you can explain in more details

"compactified" means the fourth dimension could be curled up super small — so tiny that we can’t see or feel it.

Think of a garden hose:
From far away, it looks like a straight line (1D).
But up close, an ant walking on it would feel two dimensions — forward/backward and around the hose.
To us, the round part is too small to notice, so it just looks like a line.
How that works with 4D:
If the fourth dimension is curled up at a microscopic size, any 4D forces would also be super tiny. That’s why we wouldn’t feel them — they’d be stuck at that tiny scale and not mess with our 3D world. soooooooooo yea

@ang001 said in #4:

maybe we are seeing stuff that really should not be in the 3rd dimension anyway, but we 'perceive' it as being normal because we're conditioned to believing it is.

Thats a sigma idea. Maybe some weird stuff we see — like quantum effects or strange coincidences — could actually be 4D stuff bleeding into 3D. But since we’ve only ever known life in 3D, we just assume it’s normal.

kind of like if a 2D creature saw a sphere passing through its plane — it would just see a circle growing and shrinking, not realizing it’s part of a bigger 3D shape. maybe there’s 4D stuff happening around us, but we just don’t have the right perspective to understand it.

well, isn't fourth dimension time?
if we live in 4 dimension, we could time travel. I am not sure but i think if we could cross 4th dimension we could time travel.
right now , travelling a speed of light i think we could achieve that but we could only time travel to future.
I don't think living in 4th dimension is habitable.

My personal theory is : we live b/w dimensions , i mean multiple dimensions, and time is one component of it.

what if we live in 4th dimension, and we couldn't draw 1D figures or 2D figures ?

well that's my opinion so an assumption and may be wrong but right now what i think it is look like!

I always dislike it when I have to clarify that I am not talking about time and about spatial Dimensions..

@tcip said in #8:

I always dislike it when I have to clarify that I am not talking about time and about spatial Dimensions..
No one asked you?

Ever consider that a spatial dimension might not be straight? A dimension could wrap back into itself. These dimensions would hardly be measurable and would explain physical properties such as rest energy, electric charge, and mass. All our knowledge of physics is based upon observations, so everything that occurs may be called strange phenomena. The fact that things follow measurable laws does not refute the theory of a fourth spatial dimension.