Water does not scale. That single fact is why a miniature tidal wave tearing through a model city remains one of the hardest shots in cinema, and why practical effects still beat generative video at it. A city can be built at any ratio. The water cannot. Gravity stays at 9.81 m/s². Surface tension stays at roughly 72 mN/m. Viscosity does not shrink to match the buildings. The workaround is Froude scaling. The Froude number, Fr = v/√(gL), governs gravity-driven free-surface flow, and gravity does the scaling for you. Hold it constant and time compresses with the square root of the length ratio. - At 1:25 scale, the miniature completes its collapse five times faster than the real event - Overcrank the camera to roughly five times normal speed, around 120 fps - Play back at 24 fps and the timing reads as full scale That fixes motion. It does not fix droplets. The Weber number weighs inertia against surface tension. Shrink the scale and surface tension dominates. Water refuses to atomi...