4th dimension doesn't exist because even 1D or 2D themselves are not real.
1D and 2D are just mathematical abstractions. Everything is just 3D and that's it. There is no time, just space with a state.
(I tried to explain better in comments so please check that. I would be glad if someone could give me a response to this brain fuck I’m having)
Personally, and take this with a grain of salt, I feel like you’re overthinking it. Everything at some level is just an abstraction of something else. So what. Dimensional exist whether you acknowledge them or not. 🤷♂️
Dimensions are primarily about coordinate systems. They are about the question of "Where is something?".
1D and 2D exist and are used all the time. If you are moving your pawn to e3 in chess, you are using a 2D coordinate system.
If you have an accident and you call emegency systems and tell them that you are at highway kilometre 134.5, then you are using a 1D coordinate system.
Higher dimensionality coordinate systems exist too. For example, if you watch a live-rendered 3D animation (laso not something that's pre-rendered into a flat video), then it's a 4D video. Objects in the video have fourdimensional coordinates: a 3D position and a timestamp. In statistics you often have much higher dimensional data as well.
The idea that there would be an n-th dimension as a physical space is nonsense and it's also not what dimensions are about at all. That's what happens if fiction authors hear fancy terms without understanding what they are about.
Edit: in fact, three dimensions are only enough to describe the position of a thing in real life, but things also have rotation. That's another 3 dimensions. And since e.g. humans can rotate a ton of things, each of these things is another dimension for each rotational axis.
We have no evidence of a 1 or 2 dimensional universe existing, just like we have no evidence of a 4 dimensional universe existing. That might be because they don't exist, or it might be because we can't look into other universes.
If time is a dimension or not, that depends more on what you think the word "dimension" means than on what time itself is.
I need to get you to sit down for a philosophical discourse with the Time Cube guy.
I spent a lot of time reading the time cube guys rants, and I'm like 90% sure they just never understood that if you rotate a cube enough on both axis it resembles a globe.
He just didn't understand that the earth has multiple times zones because it's a big old globe, instead of 4 timecube-zones, because he couldn't understand how surface area stretches over a globe, just a cube.
Anyway, my two cents. Sometimes ranblings are just a misunderstanding of basic math or scientific concepts.
Sorry 2D /3D OP, but you're a great example too.
You want to claim 2D or 3D aren't "real" when what you're simply trying to say is that we, as humans, with limited and dull senses, are incapable of perceiving dimensions / universes that exist outside our own.
No shit.
That doesn't mean they don't exist. For that, it requires tools that exist outside our perception, but are universally sound. Aka Math.
So yeah, we can prove other dimensions exist with math, but can't perceive them because we're meat.
That doesn't mean math is bullshit, it means you need to read philosophy enough to understand our existence isn't centered on human perception.
We're monkeys that have harnessed self awareness to the point we can prove there's a reality that exists outside our limited perception. But simply because that's only doable through math, doesn't mean it doesn't exist.
It means your feeble human body is literally only capable of understanding extradimensionality because of the meat in your head, and it's ability to comprehend math.
You are meat. But math is universal. You are limited in perceiving the universe to what your meat has given you. So doubt your meat, not the math.
It's what the time cube guy should have done imo.
Pssshhhhh! I'm in the 39th dimension. Thats the one where colors start having tastes! And fingernails scream as you violently pull them out with pliers.
This guy must be from Ohio.
I believe you
1D and 2D are just mathematical abstractions.
So are all dimensions. The number of dimensions is just an attribute of a vector space, and vector spaces are just models we humans define to describe natural phenomenona. You can claim that some of these models are more useful than others. But at no point does it make sense to claim that a model "exists" or not. There would be no meaning to such a statement, it would contain no information. Not wrong, just nonsensical.
Yes, they are only abstractions, just like numbers are. I do not understand your conclusion that they therefore do not exist.
I still upvoted this, because I can see where you are coming from. It's frustrating when adults portray thin flat objects as "2D objects" to explain dimensions to children. It's not a simplification; it's simply wrong.
I get what you are saying, but it is not wrong. It is not even a simplification. The surface of any object is 2D, and the surface of a flat object is the simplest form of a 2D coordinate system.
A "dimension" is just something that can be measured. Imagine you have a square of paper and it has 5 coins on it. It has a width, a height, a thickness, a coin count. That's 4 dimensions already. It also has zero elephants on it, now we have 5 dimensions!
The trick is to only consider the "dimensions" you're actually interested in.