The fluid shape smooths airflow over the car, which keeps it stable and improves fuel economy.

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This two-button blazer and wool-crepe trouser has a light, fluid shape, ideal for warm days, and the straight-leg trouser hits just above the hip.

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Fluid as they are, his best films have moments that shape the whole.

ECONOMIST: Richard Leacock

Although the lenses are fixed in shape, they are connected via a network of fluid-filled channels, containing a light-absorbing pigment.

ECONOMIST: REPORTS