the fourth dimension is where a certain three dimensional object is at a certain time, the fourth dimension IS time.
for say, if we had a cube on all of our desks, one half of it was in the third, one half of it was in the fourth.
we would only see half of it at any certain given time.
Scientists predict that this is how time travel is possible.
Holy crap, I suddenly understand this again. Yes, again. A few months back I remember someone posting a video perfectly explaining the fourth dimension.
Basically, in the fourth dimension, objects are viewed from every angle at the same time. It would be great if someone could find and post this video again.
I was thinking of the fifth dimension, instead, I found this in another topic. Still looking for that video, in the meantime:
The fourth dimension
This is experienced every day, but only one place at a time. Just as a 2d object is just one cross-section of a 3d object, the 3d object is just one point of a 4d object.
If we dropped a cube onto another object, we will see it move. In the fourth dimension, we could see any part of this movement at will. Just as we can see any point along the height of a pole, we could see any point in space at any point in time. However, we would only see the future in a single way, as a pre-determined pathway without:
The fifth dimension
Just like the fourth dimension deals with points along a timeline, the third dimension deals with points along a third vector, the second dimension deals with points along a second vector and so on; the fifth dimension deals with points along many different timelines.
If you could see five dimensions of a certain physical point, not only could you see the height, width, depth and timeline of it, but you could also see every possible situation that point could have been in. If this is hard to understand, try this:
Let's take a point on Earth, next to a beautiful lake. Now, we could see the Earth spin under this point along the timeline in the fourth dimension, from the time this point existed to the point it stopped existing. If we saw the same point in the same time, but in the fifth dimension, we could see any possible configuration of this scenery. Instead of this beautiful lake, perhaps Earth formed an identical lake out of lava instead, and Earth is a barren mess of volcanic activity. Or, perhaps, the lake was two centimeters deeper than the one we saw.
Here is the video explaining the fourth dimension, it should help.
