Recently I found this great set of minimalist posters by Emil Ruder, Swiss typographer and graphic designer. Ruder (1914-1970) played an important role in the development and dissemination of the Swiss Style.

“Typography has one plain duty before 
it and that is to convey information 
in writing.” - Emil Ruder

He has helped, together with Armin Hofmann, to found the Schule für Gestaltung, Basel (Basel School of Design), and was known for encouraging his students to be more concerned with precision, proportions and the role of legibility and communication with type.