Infinity is a tricky concept - a 2D creature on the surface of a 3D inflating balloon would view the surface they were on as infinite, particularly if the ballo

Infinity is a tricky concept - a 2D creature on the surface of a 3D inflating balloon would view the surface they were on as infinite, particularly if the balloon was inflating faster than the bug could travel, such that no circumnavigation of the sphere was possible. Infinite space implies that one could travel forever in a straight line without encountering a boundary, but if we move to higher dimensions then it's possible that the universe is something like a 4D sphere of finite 4D volume bounded by a 3D 'surface' which is apparently infinite to its inhabitants. Moving to higher dimensions it might be the case that there are many universes, i.e. perhaps from a 5D perspective the multiverse is an infinite series of nested 4D universe hyperspheres, and one could go on and on like this into a infinite series of dimensions, but it's all just mathamatical metaphysics at that point as there's no observational evidence for any of that.