Theo Zamenopoulos, of the OU design faculty, offers a glimpse into the ideological and historical context of design ideas and principles. With Emma Curtis, curator of the Design Museum, and Nathaniel Hepburn, curator of the Mascalls Art Gallery, Theo looks at the key ideas that emerged as the driving force behind design using specific examples from the history of chair design. This material forms part of The Open University course T217 Design Essentials.