since foreign films were banned in Germany during the first world war there was a high demand for films to be produced due to hyperinflation as people could now afford to go to the the theaters as it was very cheap and easy entertainment for everyone. improvements in technology allowed films to be made and released quicker and these films often showed darker themes such as crime, power and human behavior in a cheaper way giving it its own style and aesthetic. This basically creating Gothic horror and the noir genre in film.