Power-station cooling towers curve inwards
A big concrete bottle-shaped tower, narrow in the middle, flaring at the base.
Category: Buildings
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Feature. The curve is stronger and moves air.
The hyperboloid shape is built from straight lines, so it can be made of thin reinforced concrete yet stay stiff against wind. The narrowing also helps the warm air rise through the tower.
Source: Cooling tower: hyperboloid cooling tower, Wikipedia.