abstract:A barrel roof is a curved roof that, especially from below, is curved like a cut-away barrel. They have some advantages over dome roofs, especially being able to cover rectangular buildings.
It was a Eureka-like moment for Mr. Buren who had spent several fruitless months trying to find a way to create something that wouldn't be utterly overwhelmed by the volume of the Grand Palais' nave and its massive glass, barrel-vaulted roof.