The water you see moving on our homepage is not a video loop. It’s a live simulation running in your browser, solving a simplified version of the equations that govern how real fluids move — the same family of math used in visual-effects software for film, scaled down to run in real time.
Most animated water on the web fakes movement with a single swirling pattern that never really responds to anything. Ours computes an actual velocity field each frame, including a pressure-correction step that keeps the fluid roughly incompressible — which is a technical way of saying: when you push water in one place, it has to go somewhere, and the simulation actually works that out rather than assuming it.
The practical result is that moving your cursor across the pool produces a ripple that spreads, bends around its own previous ripples, and fades the way real water does — because, in a small way, it’s obeying the same physics.