"If you observe something long enough, you’ll see something peculiar. If you can’t see something peculiar, if you stare long enough, then that in itself is peculiar. And then you try to explain the peculiarity... A lot of it is, I'm convinced, done by the subconscious... You look - it depends on what kind of thing you are dealing with - but you look at it until you see something that attracts your attention, your curiosity. Maybe it doesn't suggest anything at all. You go on to something else. The next day you come back and look at it again."