@Scivf4 If you "unfold" a cube, it would then appear as 6 flat squares. Putting those squares together in a 3d surface would assemble a cube. The tesseract is the result of assembling cubes in the same manner in a 4d surface.
@Scivf4 I actually know about this - it's called the tesseract. Its essentially the 4d version of a cube, assuming a square is a 2d equivalent. The key to this visual is that it can't show you the whole shape at once, it's not conceivably possible, it can rather represent it in 3d states