Mutsuro Sasaki is a pioneering Japanese structural engineer who has helped shape contemporary Japanese architecture. The success of his approach can be seen in many award-winning projects, the most notable perhaps being Toyo Itos Sendai Mediatheque of 2000 for which Sasaki and Ito were jointly awarded the prize for built work from the Architectural Institute of Japan. This lecture precedes the opening of an exhibition of his work in the AA Gallery and the publication of Morphogenesis of Flux Structure.