In so far as recognition of a sense-object is confined to primary recognition within the present duration, the sense-object and the event do not clearly disentangle themselves; recollection and memory are the chief agents in producing a clear consciousness of a sense-object. But apart from recollection and memory, any factor, perceived as situated in an external event, which might occur again and which is not a relation between other such factors, is a sense-object. Sense-objects form the ultimate type of perceived objects (other than percipient objects) and do not express any permanence of relatedness between perceived objects of yet more fundamental types. 23.3 A sense-object, such as a particular shade of redness, has a variety of relations to the events of nature. These relations are not explicable in terms of the two-termed relations to which attention is ordinarily confined. The events which (in addition to the sense-object) enter as terms into such a relation can be classified into three sets (not mutually exclusive), namely (i) percipient events, (ii) events which are 'situations' of the sense-object, (iii) conditioning events. 23.4 A percipient event in the polyadic relation of a sense-object to nature is the percipient event of an awareness which includes the recognition of that sense-object. An event is a situation of the sense-object for that percipient event when for the associated awareness the sense-object is a quality of . Now perception involves essentially both a percipient event and an associated duration within which that percipient event is set and with which it is cogredient. A situation of a sense-object in respect to a given percipient event occurs within the associated duration of the percipient event. In fact the content of the awareness derived from a given percipient event is merely the associated duration as extending over a complex of events which are situations of sense-objects of perception and also as extending over the percipient event itself. For example, an astronomer looks through a telescope and sees a new red star burst into existence. He sees redness situated in some event which is happening now and whose spatial relations to other events, though fairly determinate as to direction from him, are very vague as to distance. 23.5 We say that what he really sees is a star coming into being two centuries previously. But the relation of the event 'really seen' to the percipient event and to the redness is an entirely different one from that of the event 'seen' to these same entities. It is only the incurable poverty of language which blurs the distinction.