Desperate for cash in 1944, Disney re-released Snow White in theaters. It earned $3 million on near-zero cost. The accidental discovery: 7 years is just long enough for a new generation of children to reach theater age. Disney has used this cadence ever since — Frozen 1 (2013), Frozen 2 (2019), Frozen 3 (2027). The vault is the fourth node of the flywheel and the most misunderstood.