Eduardo Torroja, Felix Candela and Miguel Fisac were part of a generation of structural architect-engineers who pushed the use of reinforced concrete to the limit. Creators of structures of extraordinary efficiency and lightness, they used continuous ruled surfaces with a unique talent and imagination. Their works are not only functional, but from them emanate magic and poetry: sublime curves... waves of concrete. Buildings that seem to be living creatures form one of the most passionate moments of twentieth century architecture.