And then he felt the floor hard against his back.

I felt something round and hard press against my back.

He let his head rest against the chair's high back.

I stood up straight with the tree against my back and said nothing at all.

I sat very straight against the back of my chair.

The sun of late afternoon was warm against his back.

Against the back of the building was a fire escape.

She turned her head in against the back of the couch.

He felt something hard pressed against the back of his head.