When it comes to a fourth spatial dimension, we have yet to experimentally demonstrate it actually exists. Some theoretical models of physics (such as String Theory) mathematically represent more than three spatial dimensions. That doesn’t necessarily mean though that those dimensions exist in a way that a human, or any complex object or organism would be able to interact with.
When talking about higher dimensions it could be that only sub atomic particles are able to move through or interact with them, that they may be folded in on themselves having collapsed after the beginning of the universe or only exist in universes different to our own.
There is no hard and fast answer to your question beyond saying that if a fourth spatial dimension does exist, it may be physically impossible for you to interact with it in any way that would be meaningful to you.
Ulahn t1_j6fhgbq wrote
Reply to Eli5 why we can’t see the 4d world around us by Supastash
When it comes to a fourth spatial dimension, we have yet to experimentally demonstrate it actually exists. Some theoretical models of physics (such as String Theory) mathematically represent more than three spatial dimensions. That doesn’t necessarily mean though that those dimensions exist in a way that a human, or any complex object or organism would be able to interact with.
When talking about higher dimensions it could be that only sub atomic particles are able to move through or interact with them, that they may be folded in on themselves having collapsed after the beginning of the universe or only exist in universes different to our own.
There is no hard and fast answer to your question beyond saying that if a fourth spatial dimension does exist, it may be physically impossible for you to interact with it in any way that would be meaningful to you.