what is 4d?

Question

http://www.superliminal.com/cube/cube.htm
define it please

Answer 1

I'll try to do this by analogy. Suppose you want to describe a usual, 3 dimensional Rubik's cube using only diagrams on a plane. One way to do this is to imagine the faces of the cube flattened out after taking the top off: you would have a central square (the bottom) surrounded by four other squares (the sides) all of which are composed of nine smaller squares.

The website takes this to a higher dimension. A four dimensional hypercube has a top and bottom also. If you take off the top and 'unfold' the cube, you get a central cube surrounded by six other cubes. In the 4 dimensional game, each these side cubes consist of 27 colored cubes. Clicking in various ways rotates the faces of the hypercube or rotates the hypercube itself so you can see the 'top'.

Answer 2

The concept of a fourth dimension is one that is often described in considering its physical implications; that is, it is known that there are three dimensions: length (or depth), width, and height. The fourth dimension is orthogonal to the other three spatial dimensions. The cardinal directions in the three known dimensions are called up/down (altitude), north/south (latitude), and east/west (longitude). When speaking of the fourth dimension, an additional pair of terms is needed. Attested terms include ana/kata (sometimes called spissitude or spassitude), vinn/vout (used by Rudy Rucker), and upsilon/delta. The fourth dimension is often identified with time, and as such is used to explain space-time in Einstein's theories of special relativity and general relativity. In this case, the concept of an additional spatial dimension would be referred to as the fifth dimension. In this article, however, we discuss the implications of considering the fourth dimension as another spatial dimension.

Answer 3

"4-dimensional

adjective
involving or relating to the fourth dimension or time"


4D always puzzled me, too. I don't think anybody really understands it. It just has time involved in it somehow.

Answer 4

1D = line
2D = two lines intersecting at a right angle
To get 3D, add another line intersecting both of the previous lines at a right angle to each.

To get 4D, add another line intersecting all three of the previous lines at a right angle to each.