Another example: Bava manages to produce chills by shooting a horse carriage in slow motion and soft focus. It creates a ghostly image. Later, after a hapless doctor is carried in the carriage, it rides faster than is humanly possible, adding a contrast just as creepy as the first glimpse of the carriage.
Black Sunday is a masterpiece. It kicked off a stellar career for Bava, who would later show how well he could use color to invoke terror in audiences. There is a long, interesting essay on Black Sunday in Danny Peary's first volume of "Cult Films."