You cannot recognise an event; because when it is gone, it is gone.

You may observe another event of analogous character, but the actual chunk of the life of nature is inseparable from its unique occurrence.

But a character of an event can be recognised.

We all know that if we go to the Embankment near Charing Cross we shall observe an event having the character which we recognise as Cleopatra's Needle.
Things which we thus recognise I call objects.

An object is situated in those events or in that stream of events of which it expresses the character.