A present that belongs to the world
Presentism and the growing block preserve objective becoming. Their strongest motivation is also the source of their hardest physical problem.
An alternative to eternalism begins with a conviction that our experience of arrival discloses something real. An anticipated event becomes present, then recedes into memory. Perhaps this transition belongs to the world itself. On that view, becoming is an ontological process: existence changes as time passes.
This position deserves a stronger presentation than “common sense resists physics.” A mathematical model can arrange events without fully explaining their actuality. Representing future events as coordinates does not, by itself, demonstrate that those events exist. The defender of becoming asks whether an elegant description has been assigned a metaphysical authority it has not earned.
The question is legitimate even when eternalism remains the more attractive interpretation. An account grows stronger through objections that reach its premises. Intuition alone cannot overturn relativity, but relativity’s success does not automatically settle every philosophical claim attached to it.
Two forms of becoming
Presentism and the growing block differ over the past. Presentism restricts temporal existence to the present. The growing block retains past events and adds new ones at its leading edge; the future has yet to join reality. Both give the present a role that eternalism need not assign it.
The attraction of presentism is its directness. What happens now exists; what has happened no longer does; what will happen does not yet. Its difficulty is explaining truths about events that lack existence. The growing block avoids that particular difficulty by preserving the past, though it must explain what singles out the newest edge as present.
Neither view guarantees libertarian free will, understood as freedom incompatible with determinism. A universe could produce genuinely new events under deterministic laws. Conversely, events could be indeterministic without being authored by a person. An open future and an autonomous will would still need to be connected by an argument.
The demand for a physical present
The major physical difficulty is identifying the present across separated locations. Under special relativity, inertial observers in relative motion can assign different times to distant events. If existence follows a universal present, its defender must explain which grouping of events has that status and how the grouping relates to the successful relativistic description.
One route introduces a preferred temporal structure beyond what ordinary special relativity identifies. This might preserve the empirical predictions while assigning additional metaphysical significance to a particular slicing of spacetime. The objection is then explanatory: why posit a structure that the observed physics does not require? An unobserved structure is not automatically incoherent. It is also not established because we want it to secure an intuitive account of time.
Another route explores local becoming: a temporal transition associated with a locality or an observer’s worldline rather than a universal advancing surface. This changes the question. We would need to know whether many local transitions can provide the kind of becoming originally sought, and how they fit together without an absolute present.
These alternatives reveal a real philosophical choice. Eternalism can accept the absence of a privileged global now and explain our experience from within the resulting temporal structure. A theory of becoming can insist that something important is missing from that structure. Its task is to identify the missing element precisely enough that its explanatory contribution can be assessed.
The pressure exerted by experience
Our experience of succession deserves explanation. It does not straightforwardly tell us which ontology explains it. We experience a new note arriving in a melody, a decision becoming urgent, and a loss receding into the past. These are intimate facts about conscious life. Their presence in experience leaves open whether an observer encounters successive temporal conditions or whether reality itself undergoes an additional transition.
There is a corresponding weakness in some eternalist arguments. Simply renaming passage “an illusion” can conceal the phenomenon that prompted the question. Even a misleading appearance has a structure and a cause. Explaining why passage seems fundamental requires more than asserting that the mathematics contains no moving present.
The strongest case for becoming therefore concerns explanatory completeness. It asks whether a world described entirely through temporal relations can account for the distinction between an event being anticipated and that event being lived. The strongest reply is that this distinction may belong to the observer’s temporal situation and informational state. The disagreement concerns where the distinction resides.
Eternalism remains a central working position in this archive because it fits naturally with a relativistic account that grants no universal present. Presentism and the growing block remain substantial competitors because they challenge the step from physical representation to claims about existence. Their value is not merely to provide balance. They identify what an eternalist explanation still owes us.