Create a tank with interesting currents, and place some neutrally buoyant particles in it to see the current.
Neutral buoyancy is tricky, so easier might be very small bubbles which, with light, can be very visible due to total internal reflection. Perhaps a gas that is denser than air to make them rise even slower.
Another easier route would be simulation with computer graphics, but we need a way of viewing the particles in 3D: virtual reality. Lorenz system.
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