All we know of the characters of the events of nature is based on the analysis of the relations of situations to percipient events.

If situations were not in general active conditions, this analysis would tell us nothing.

Nature would be an unfathomable enigma to us and there could be no science.

Accordingly the incipient discontent when a situation is found to be a passive condition is in a sense justifiable; because if that sort of thing went on too often, the _role_ of the intellect would be ended.
Furthermore the mirror is itself the situation of other sense-objects either for the same observer with the same percipient event, or for other observers with other percipient events.

Thus the fact that an event is a situation in the ingression of one set of sense-objects into nature is presumptive evidence that that event is an active condition in the ingression of other sense-objects into nature which may have other situations.
This is a fundamental principle of science which it has derived from common sense.
I now turn to perceptual objects.