You have to be able to see it against something.

He saw one, against the side window of the store.

She could not see his face clearly against the light.

They were close enough to see her against the stars.

I wanted Robert to see them against a different background.

Not easy to see against snow or a rock face.

He met the first man coming up, before the fellow could see his face against the office light.

I had to try to see him against his own background.

He looked up between the trees where the sound came and could see nothing against the stars.

Do you fear that this will be seen as a sort of war against the police?