<iframe width="420" height="315" src="http://www.youtube.com/embed/UnURElCzGc0" frameborder="0" allowfullscreen></iframe> We learn in school that 1-D is a point. And that 2-d is a stretching of that point in a linear way in one plane. 3d is obviously easy to grasp since we live in a 3-d world. 4-d is something very intriguing (i don't know much besides how it's supposedly shaped), but to me, the idea of 2-D is still very perplexing. Ok, I get that 2-D is an extension of 1-D in one plane, but there's actually no existence of a so called 2-D in our world? Think of a sheet of paper. You may think it's 2D, but it's still 3D because no matter how flat it is, there is always a very minute height to that paper. So how do you explain 2D's existence in the universe?
Well I guess I looked it up and sort of found my answer; but it's still very confusing lol I guess each dimension shouldnt be looked as a "place" but rather as "directions"
Imagining extra dimensions can be difficult for sure, here's a clever walk through from ages ago. http://www.youtube.com/watch?v=JkxieS-6WuA And also, Carl Sagan is my hero. You have been repped
Well what if you drew a picture on that piece of paper? The ink would absorb into the paper and would have no height. Thus the image would be 2D. It's like going to the theater and watching a movie on a screen. The screen itself may have 3 dimensions, but the image projected on it only has two. Even as you're reading this on a computer screen, the text has no actual depth and is 2 dimensional.
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If Ink "absorbed" into the paper it would fill the same depth of the paper and + the microscopic amount of matter from the ink itself added to it. So no, technically not 2D.
True, but we cannot manipulate time innately. We can only interact and perceive the world in 3D no matter how hard we try.
Do you guys think ants think of the Earth as round? Ants sort of live in a 2 dimentional world, because they are so small. Even though they are able to climb up a tree and hence travel in all 3 dimentions, because they are so small, they probably have no idea about the shape of the Earth. They must think that everything in the world is flat. Even a tree trunk, etc. they they cannot see and therefore comprehend the entire thing.
Ants can't think period. If they were able to reason, then I think the effect of gravity on their bodies would be a hefty indicator of how they perceive the world. Of course, they can't think.
Or parameters. A point has 0-D, not 1-D as you stated in the OP. 1-D is a line. If you fix some reference (zero) point on the line, you can then describe any point on the line with just a single parameter (number) that describes how far (and on which side) from the zero point the point in question is. Note that I am not talking only about straight lines, the line can be curved and it will still be 1-D. The reason is that to see this curvature of the line you have to "move up" to two dimensions which in a 1-D world you cannot do. Similarly, a surface or a plane (a flat surface) is two dimensional. You can describe any point on a surface with two parameters. And 3-D, of course, you know very well. But again, we are used to thinking of space as being flat which does not have to be (and is not) the case to still describe any point in it by three parameters. Time is the 4th parameter giving you the 4-D spacetime.
