This lecture surveys essential concepts and significant past and current projects that deal with interactive, responsive environments, i.e. buildings that can change their configuration, appearance, and environmental conditions in response to patterns of occupation and context (and in return can shape those too). The principal argument is that change in architecture is far from being adequately addressed or explored theoretically, experimentally, or phenomenologically. The lecture discusses Kolarevic's latest book on "Building Dynamics", one of the first books to offer a coherent and comprehensive approach to this topic and provide numerous examples of cutting-edge work from leading designers and engineering firms. An essential lecture for professionals interested in the latest design techniques and mechatronic technologies, and for students taking design studio classes or courses in theory or technology at any level.