No one thinks of the note as a property of the concert-room.

We see the blue and we hear the note.

Both the blue and the note are immediately posited by the discrimination of sense-awareness which relates the mind to nature.

The blue is posited as in nature related to other factors in nature.

In particular it is posited as in the relation of being situated in the event which is its situation.
The difficulties which cluster around the relation of situation arise from the obstinate refusal of philosophers to take seriously the ultimate fact of multiple relations.