The 4th dimension is something that philosophers and physicists have pondered on for over 200 years. No dimensions is represented by a dot. One dimension represents a line. Two dimensions represents an area (like a square). Three dimensions represents a volume (like a cube). But four dimensions… where do we go from there?
In my experience, people generally tend to think that time is the 4th dimension. And in
physics, this is generally true: they call it spacetime, and it is exactly as it sounds, the combination of space and time. However, mathematically that presents a problem, because spacetime is calculated using different values than what the regular three dimensions use (length, area, volume). Mathematically, one can do calculations in the 4th dimension just as with length, depth and breadth but it doesn’t really make logical sense to us, because (most) of us cannot visualise the 4th spatial dimension. There are a few high-level mathematicians who have claimed to have witnessed the 4th dimension! (Apparently the head of Maths at Adelaide University is one such person).
In reality, those who spend most of their time thinking about these sorts of things generally agree that there are actually even more than 4 spatial dimensions. For example, String Theory helps to overcome some of the problems of relativity discussed in my last article about physics, but demands 11 dimensions to work! The problem is, living in a 3D world, it is practically impossible for us to imagine something that extends that world into another space. Imagine trying to tell a cartoon character living in a 2D world that they’re missing out on 1/3rd of the universe!
They knew everything in the 90s, see if you can try to follow the video below with it’s incredibly stimulating music!
My personal hypothesis is that we can’t possibly see in the 4th dimension with only two eyes.
With one eye, you can really only see in 2D, because you have no sense of depth (unless there is movement). With two eyes we can see in 3D because we are shown multiple images of the same object at the same depth. By similar extension, could three eyes at different depths give us a view into the 4th dimension? I couldn’t find anything about this on the internet, so either I’m a genius or just being ridiculous.
Interestingly, there is quite a lot hypothesised about the 4th dimension. For example, 4th dimensional objects have 3D shadows (shown in the two moving images). Something in the 4th dimension would be able to see all sides of a 3D object and inside simultaneously. Imagine! But again, when we try to visualise it in 3 or even 2 dimensions (as you are looking at the images and videos on this page), much of the information is lost.
Finally I have another video for you presented by a man with a voice that I could listen to for hours. This one explains well the conundrum that we have in trying to imagine the 4th dimension from the three dimensions that we know all too well.