  Having looked in some detail at two of the main forms of PT-realism – the Cinematic approach (in §4.1) and the Extensional model (in §5) – there remains the third: the Retentional model. Although the Retentional model itself comes in several variants, its proponents share a distinctive conception of the structure of temporal consciousness. Whereas Extensional theorists hold that our immediate experience of change and succession occurs within specious presents which are themselves extended through time, Retentional theorists hold that individual specious presents lack temporal duration, but have contents which succeed in presenting (or representing) temporally extended phenomena. As standardly conceived, a Retentionalist specious present consists of a complex of experiential contents, comprising an instantaneous (or near-instantaneous) phase of immediate experience, together with a collection of representations – retentions – of the recent past, all packaged into an episode of experiencing that is momentary; a stream of consciousness is composed of a continuum of these momentary  episodes.[18]