CONCEPT
The Arrow of Time
Prigogine's insistence that irreversibility is not a subjective illusion produced by macroscopic coarseness but a fundamental feature of physical reality — and the diagnostic that distinguishes human creativity from machine computation.
Pierre-Simon Laplace imagined an intelligence vast enough to calculate all future states from the present. Prigogine spent his career arguing that such an intelligence, however powerful, could not actually predict the universe we inhabit — because the universe is irreversible in a way that deterministic equations cannot capture. Time flows in one direction. The past is genuinely past. Eggs break and do not unbreak. Civilizations rise and fall and do not rise again in the same form. The arrow of time is not a subjective illusion. It is built into the dynamics of complex systems at every level, from molecular to civilizational.
In The You On AI Field Guide
The argument for the reality of the arrow proceeded in three stages across Prigogine's career. First, the demonstration that far-from-equilibrium systems exhibit behaviors — dissipative structures, self-organization, bifurcation — that cannot be derived from time-reversible equations. Second, the claim that irreversibility is present at the microscopic level, in