About this font family
Twentieth Century was designed for the cover of a collection of 20th Century French Poetry and was drawn with the intention of using only pure geometric shapes. It is the distillation of a broad variety of styles loosely known as Art Deco but, also categorized under such terms as Moderne, Streamline, Machine Age, Futurist, 70s Art Deco, Memphis among others.
If there were one source in particular that I would cite as my inspiration, however, it would definitely be the work of Frank Lloyd Wright. I mean, look at the “W” for cryin' out loud!