Harman, who was already building crude canoes for his fishing expeditions, began experimenting with curves and spiral shapes. He sketched his vision for a boat “as nature would have designed it,” and took it to a boat-building expert who told him that it couldn’t be done.
The Lily Impeller is a mixer “designed using the elegant and effective geometries found in natural fluid flow,” its designer has explained. Its shape, based on the logarithmic curve (known as the Fibonacci spiral) found in nautilus shells and whirlpools, accommodates a centripetal flow of liquid with little friction. As a result, the device is capable of circulating millions of gallons of water with a minimal amount of energy. Used in municipal reservoir tanks, the mixer prevents drinking water from stagnating, reducing the need for disinfectant additives.
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