Circulation is the repetition of motion along specified routes of transit; withon a medium. Circulation is not circulation without such repetition - that is, the transit, when repeated, becomes circulation. It is a transit loop. It is a history of couplings between a subject and environment. Broadly, circulation is those processes responsible for the circulation of energy, matter and meaning. IN particular, the attention here is on the systemic nature of these processes, and the circuits that arise from the histories of their transits, transitions and transformations.