Title: Norton's Dome: A Physical Demonstration of Completing Closure

In 2003, John D. Norton described a thought experiment that has generated over thirty academic papers and remains unresolved: a ball balanced on a specially-shaped dome admits infinitely many valid Newtonian solutions. The philosophical literature has debated whether this is physical, whether it violates causation, whether Newtonian mechanics is truly indeterministic. Thirty papers. No resolution. This paper resolves the paradox through the Completing Closure Principle. Norton's Dome is a macro-scale Grandi series—a physical system where rules constrain but do not determine outcomes. We address each major objection in the literature (Lipschitz violation, time-reversal fragility, causation, infinite precision, incomplete physics), demonstrate that the "at rest at apex" state is dynamically unreachable, and identify the Lipschitz condition as the mathematical boundary marking where closure becomes necessary. Phase transition experiments provide statistical confirmation: the width of nucleation survival curves is the closure signature. We derive a falsifiable prediction: no experimental apparatus, regardless of precision, can prepare a ball at rest at the apex. One success refutes us. After twenty-two years of philosophical debate, this remains untested.