A female head appeared in profile at the next pane, so that it turned, strangely, in the direction in which the blind was facing. Thereupon the owner of the head nodded in a very friendly manner and hid herself again behind the blind. First of all, I inferred that the person she greeted was a man, for her movement was too excited to be evoked by the sight of a girl friend; secondly, I inferred that the person the greeting was meant for usually came from the other direction.