"When he at least reached the door the handle had cease to vibrate. Lowering himself suddenly to his knees he placed his head and the vagaries of his left eye (which was for ever trying to dash up and down the vertical surface of the door), he was able by dint of concentration to observe, within three inches of his keyholed eye, an eye which was not his, being not only of a different colour to his own iron marble, but being, which is more convincing, on the other side of the door."