This is a photo of inside of a trash can.

If you've seen the move Labyrinth you'd know what im talking about. But for reference here is what im going for. Not the same angle however...
http://www.leagueofgentlemen.co.uk/...../labyrinth.jpg

The face of the knocker is facing left on the top half of the picture. And the white lines that goes from top to bottom on the right side of the picture. Imagine that as the door, Opening into the darkness behind it. And in the bottom half of the picture, (under the dark horizontal line) you'll see the ring in the knockers mouth and an outstretched arm grabbing the door and opening it further. Pretty cool huh?