A formative journey from encounters with signals intelligence and cybernetics to work with colleagues, students and engineers between March 1968 and June 1972 on interactive art systems that seemed (40 years ago) to be significant. Though widely exhibited, in once case at the VI Paris Biennale, the programme was aborted in 1972 for the lack of arts research and development funding. Two conceptual frameworks: the artwork as a system; and what an engineer termed the art work's 'logic engine'. The paper asks whether the time of these ideas did, should or ever will come.