Slow as it slides along the wall,
turn a corner out of sight,
quiet it dropped to the floor,
hidden in a room without light,
care taken to move from the hall,
silent lest a foot should fall,
neatly through an open door,
across the lawn over the garden wall.

Richard Allen Beevor

http://www.poemhunter.com/poem/the-thing-on-the-wall/