After World War I, artists in France treated cars as a new kind of canvas — transforming machines into works of high art and fashion. An original exhibition at the St. Louis Art Museum, “Roaring,” explores that influence through more than 160 items and 12 vintage cars. The museum says the exhibit is its most popular since 2018. It recently expanded its hours in the leadup to its closing July 27. “Roaring” curator Genevieve Cortinovis shares her insight into the exhibit’s creation and the convergence of high fashion and beautiful cars.