Flann O'Brien, The Third Policeman pages 24-25

His face was terrifying but his eyes in the middle of it had a quality of chill and horror which made his other features look to me almost friendly. The skin was like faded parchment with an arrangement of puckers and wrinkles which created between them an expression of fathomless inscrutability. But the eyes were horrible. Looking at them I got the feeling that they were not genuine eyes at all but mechanical dummies animated by electricity or the like, with a tiny pinhole in the centre of the 'pupil' through which the real eye gazed out secretively and with great coldness. Such a conception, possibly with no foundation at all in fact, disturbed me agonizingly and gave rise in my mind to interminable speculations as to the colour and quality of the real eye and as to whether, indeed, it was real at all or merely another dummy with its pinhole on the same plane as the first one so that the real eye, possibly behind thousands of these absurd disguises, gazed out through a barrel of serried peep-holes.

Philip K. Dick, "Man, Android, and Machine" in The Shifting Realities of Philip K. Dick (Lawrence Sutin, ed.) page 211

Within the universe there exists fierce cold things, which I have given the name "machines" to. Their behavior frightens me, especially when it imitates human behavior so well that I get the uncomfortable sense that these things are trying to pass themselves off as humans but are not. I call them "androids," which is my own way of using that word. By "android" I do not mean a sincere attempt to create in the laboratory a human being... I mean a thing somehow generated to deceive us in a cruel way, to cause us to think it to be one of ourselves. Made in a laboratory--that aspect is not meaningful to me; the entire universe is one vast laboratory, and out of it come sly and cruel entities that smile as they reach out to shake hands. But their handshake is the grip of death, and their smile has the coldness of the grave.

Philip K. Dick, "Man, Android, and Machine" in The Shifting Realities of Philip K. Dick (Lawrence Sutin, ed.) page 213

My theme for years in my writing has been, "The devil has a metal face." Perhaps this should be amended now. What I glimpsed and then wrote about was in fact not a face; it was a mask over a face. And the true face is the reverse of the mask. Of course it would be. You do not place fierce, cold metal over fierce, cold metal. You place it over soft flesh, as the harmless moth adorns itself artfully to terrorize others with ocelli.