What in the world does that mean? It means that ‘now’ is like a snapshot along a timeline from the past into the future. Every ‘now’, a quantum or unit of space-time, is another snapshot of everything that exists in the universe at a particular moment, past, present or future. Taken together, these snapshots add up to all of space-time. David Deutsch, a physicist, in his book “The Fabric of Reality” says, “Relative to spacetime, nothing ever moves. What we call ‘moments’ are certain slices through spacetime, and when the contents of such slices are different from on another, we call it change or motion through space.”