Abstract
The block universe idea, representing space-time as a fixed whole, suggests the flow of time is an illusion: the entire Universe just is, with no special meaning attached to the present time. This paper points out that this view, in essence represented by usual space-time diagrams, is based on time-reversible microphysical laws, which fail to capture essential features of the time-irreversible macro-physical behaviour and the development of emergent complex systems, including life, which exist in the real Universe. When these are taken into account, the unchanging block Universe view of space-time is best replaced by an evolving block Universe which extends as time evolves, with the potential of the future continually becoming the certainty of the past; space-time itself evolves, as do the entities within it. However this time evolution is not related to any preferred surfaces in space-time; rather it is associated with the evolution of proper time along families of world lines.
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