Casting a curious gaze down on planet Earth, extra-terrestrial beings could well be forgiven for assuming that we humans are programmed in every move we make, by a palm-sized, oblong, slab of glass. More perplexing than that, who on earth could convince them otherwise ?
In telling a story one of the most successful devices for easily creating uncanny effects is to leave the reader in uncertainty whether a particular figure in the story is a human being or an automaton and to do it in such a way that his attention is not focused directly upon his uncertainty, so that he may not be led to go into the matter and clear it up immediately.