  I report on the experimental confirmation that critical percolation
statistics underlie the ordering kinetics of twisted nematic phases in the
Allen-Cahn universality class. Soon after the ordering starts from a
homogeneous disordered phase and proceeds towards a broken
$\mathbb{Z}_2$-symmetry phase, the system seems to be attracted to the random
percolation fixed point at a special timescale $t_{\textrm{p}}$. At this time,
exact formulae for crossing probabilities in percolation theory agree with the
corresponding probabilities in the experimental data. The ensuing evolution for
the number density of hull-enclosed areas is described by an exact expression
derived from a percolation model endowed with curvature-driven interface
motion. Scaling relation for hull-enclosed areas versus perimeters reveals that
the fractal percolation geometry is progressively morphed into a regular
geometry up to the order of the classical coarsening length. In view of its
universality and experimental possibilities, the study opens a path for
exploring percolation keystones in the realm of nonequilibrium, phase-ordering
systems.
