# Questions tagged [dimensions]

For questions pertaining to the structure or number of realities in a fictional setting. Soft sci-fi dimensions are often "alternate planes" separate from the "real" plane; think "hyperspace." Hard sci-fi dimensions use the mathematical concept of dimensions, in which 1-D space is defined as a line, 2-D space is defined as a plane, 3-D space typically produces Euclidean geometry, and 4-D+ space has exotic properties.

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### How could a hyperspace "ocean" work?

I've been working on a mostly hard sci-fi setting where there exists an extradimensional hyperspace that allows for superluminal travel and time travel called Deepspace or Darkspace, which has a very ...
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### Earth but without a "slice"

I'm writing a novel centered around this concept. Imagine that an ancient alien race created a 'slice of Earth' (meaning an area between two meridians) and isolated it from the rest of the planet. The ...
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### In a universe with loop dimensions how is the density of a massive body calculated? [closed]

In ordinary 3D space one can calculate the density (average density) of a massive body by dividing the mass of that body by the volume it inhabits D = M/V with M in say kg and V in say m^3 so D = [kg/...
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### How can I have normal density matter in higher dimensions?

Background The problem of sphere packing in higher dimensions is well known. In summary, the volume that equal-sized spheres (or hyperspheres) can fill inside a cube (or hypercube) decreases with ...
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### Can an n-dimensional being hurt an (n+x)-dimensional being?

Can a N dimensional being physically interact with a N+X dimensional being "sliding" a part of itself in said N dimensional world? Giving it some thought I came up with three options: Yes, ...
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### Creating an Abyss [closed]

I want to create a setting for my story that amplifies the themes of regret and the things we leave behind and feels like it has a grander purpose in the universe. I am drawing inspiration from the ...
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### Am I Using Four Dimensions Correctly?

My universe has four spatial dimensions. But there are only three-dimensional beings living inside it. For the sake of simplicity, the intelligent creatures are humans. A planet exists in space. It is ...
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### Is there a good geometric analogy for a 'trap' dimension that you can stumble into easily but is very hard to exit?

I have a magical children’s fantasy land, which is bordered by mountains on its northern side. I want to make it so that anyone travelling too far north is likely to enter one of many trap pocket ...
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### How is it possible that some extra-dimensional pouches can store living things while others can't? [closed]

The extra-dimensional pouch is a portable and lightweight container that is capable of storing almost unlimited tangible objects of any sizes inside a pocket dimension, but why might certain extra ...
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### Would an inter-dimensional being need to eat? [closed]

Would a being that could enter any space in any time, assume any shape, need sustenance or a source of energy to stay alive or does their very existence as inter-dimensional beings imply that they are ...
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### Day/night in Aether

An extremely powerful wizard decided to create a new dimension as a birthday present for his wife, this dimension is composed of flying islands inhabited by fantastic plants and animals. The islands ...
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### How would someone break into a vault in a pocket dimension? [closed]

In my fantasy world, most very rich people hide their wealth in a pocket dimension. Now, normally there are two ways to get into a pocket dimension: a spell that requires a tuning fork with a VERY ...
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### Retrieving items in a pocket-dimension-satchel

As a junior wizard, you need to carry around a lot a paraphernalia - scrolls, tomes, potions, stones, and many other things. Fortunately the Wizarding 102 class included the creation of pocket ...
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### Issues and benefits related to having the ability to see and have an affinity for portals? [closed]

I am writing a story in which people with a rare genetic ability are able to see, and are attracted to portals which lead to other dimensions. I have some ideas on how I want to differentiate good vs ...
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### A Semi-Complex, yet fictional explanation for the possibility of portals or wormholes

I am working on a Young Adult fictional story that is based upon the ability for humans to travel through portals. I have done a little research about portals, an idea that has always been interesting ...
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### How to keep the public from finding a trans-reality inter-dimensional space bridge in your backyard, and how to keep stuff from coming out [closed]

In one of my stories, three ex-SWAT team people have been recruited to guard a trans-reality inter-dimensional space bridge (basically means aliens can walk through it)in the backyard of a large house....
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### Superpowers of a 5-Dimensional Being [closed]

So, I have seen the superpowers of a 4-Dimensional Being pop up a few times on this site. However, I will instead talk about the powers of a being with one extra dimension, making them a 5-Dimensional ...
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### How would a higher-dimensional being enter a lower dimension?

So I could not get any answers for my previous question regarding what happens in a indeterministic world such as the worlds in a Cauchy Horizon of a Reissner Nördstrom Black Hole. However, I ...
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### When universes collide

Let us suppose that we have a system of multiverses, each universe within the multiverse existing as a higher-dimensional hyperspherical bubble within the yet higher-dimensional multiverse. There ...
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### Why must all deities visiting the realm of the living become mortal? [closed]

There are many states of being in this world, and some have managed to become immortal and gain the ability to manipulate nature at will to a certain extent. People called them deities and they are ...
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### What would allow a human being to create a rift in space-time and access parallel universes? [closed]

I'm creating a story where there are individuals that can travel to parallel/alternate earths. Obviously this is all fantasy but hypothetically speaking, how would you ground this is in some related ...
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### What’s the difference between inter-dimensional, inter-universal, and extra dimensional beings? [closed]

Recently, I’ve grown curious other universes and dimensions, and while looking around and reading about said things, I’ve come across the terms inter/ extra dimensions and universes. This got me ...
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### What’s the energy required to traverse through dimensions

Say in the future, humanity has developed technology to the point that it allows them to traverse through other universe, each universe having something either drastically different or not so ...
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### How can a deity be prevented from materializing without all its parts? [closed]

A horcrux is an item used to obtain a piece of a person's soul. This process is a form of immortality, in which a person who wants to cheat death would put fragments of their soul into various ...
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### Tracking time between multiple different realities simultaneously

How do I track time (using a special time system) between two realities that are not necessarily parallel but if a person jumps from one to the other what would the time be in comparison to their ...
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### How to formulate this demonic contract? [closed]

So in my D&D world, originally only a mortal on the prime material plane could contact a demon to form a contract, but now the demons have a foothold in the world and can start offering contacts ...
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Edit: edits inspired by @TzeraFNX's suggestion Suppose we have a pocket dimension or alternate dimension that's accessed a bit like Narnia, by having very subtle portals in various secluded places (...
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### Trying to make sense of a hyperspace type FTL

Can a 'hyperspace' make sense if matter entering it is very quickly 'dumped' out of hyperspace at another point in our space. That is to say, spaceship enters hyperspace and is almost immediately ...
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### Reason why dimensional travelling would be restricted

Alternate dimensions/timelines are an important part of one of my settings, a modern fantasy. Magic is well known, and it is possible for objects to be enchanted by a powerful magic user to connect ...
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### Optimal placement of a pocket dimension? [closed]

The main character of one of my stories just met a person specialized in magical tattoos, my character has chosen a tattoo which is linked to a pocket dimension. But where should the protagonist ...
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### What 4D shape could best fit a looping world?

I have an idea for a world such that the world itself is like a large loop. The best way I can think to describe it is going step by step through the "loop". Imagine a planet-like object; a sphere ...
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### The Dark is strong in the light! Why?

Last time we left off with The Dark Lord lording over their darkness in the Dark World. But the Dark Lord wants to take over our world too. Not only that but when he enters our world he gains Super-...
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### Is it possible for two dimensions to exist on one planet? [closed]

I'm writing a fantasy comics and I am stuck on a particular idea. Imagine if Hell existed on our planet. Like hell is here, we simply cannot see it, because there is an invisible barrier between the ...
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### how could a computer in the first dimension perform multiplication? [closed]

If it is possible for a computer in the first dimension to perform a second dimensional operation in the same way a computer in the second dimension can perform a third dimensional operation, then ...
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### How to keep track of everything with an infinite-dimensional telepathic ability? [closed]

The ability to telepathically communicate with and control any of your infinite other-dimensional selves is rare, but exists! Rules for how this works: Although dimensions and possibilities are ...
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### How would a species in one dimension with its own properties go to another dimension with slightly different properties?

In my world, I have three dimensions, each of which have their own special properties. From each of these three dimensions come a master race of said dimension: From the first, the master race is a ...
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### What Kind of Worlds Would Ascended Beings Live In? [closed]

We see examples in fiction all the time about sentient beings that transcend physical form into beings of thought/energy, but what kind of realms would these beings create/live in after leaving the ...
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### I'd like to set up a UI for a 2D square to access the internet-- any ideas? [closed]

I have a friend who is a square (i.e. he lives in a 2 dimensional plane on the surface of a table that I keep in my bedroom). He has decent hearing and understands English, but I'm getting tired of ...
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### Concerning Brane cosmology [closed]

EDIT: If an actor or object in a higher dimensional space with less mass than say, my car, attached itself to the car through our dimension's membrane, would it be able to move the car or hold it in ...
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