TIME

 This universe has been well described by physicists as a space-time continuum.  It has three spatial dimensions, and one time dimension at right angles to the three spatial ones. Although this concept is easy to handle mathematically it is not easy to visualize, for once within the universe our minds become to some degree trapped within the three spatial dimensions.  Which leaves the fourth dimension a bit tricky to grasp.  However, life can embrace a four-dimensional continuum.  If life could not embrace it then life could not have created the idea of the universe in the first place. (Even if it is considered that the universe was created by God he too is considered as being alive).  Indeed, this universe is within life, rather than life being within the universe. Only when we consider life to be a phenomenon generated by the masses and spaces of the universe do we have any real difficulty in grasping the nature of the universe.  This is the ultimate trap of materialism.

 We can get over the difficulty of conceiving of a four-dimensional continuum very easily by dropping one of the spatial dimensions.  This leaves us with a model containing two spatial dimensions and one time dimension.  We can conceive of this very easily.  Such a model is a cylinder closed at one end and open at the other.  The two spatial dimensions of this tube are its cross section.  The time dimension is the length of the tube at right angles to the cross section.  The closed end of the tube is the beginning of the universe.  The open end is now.  As time passes the tube gets longer.