"Apparently, there was a period when every college dormitory in the country had on its walls a poster of Hopper's Nighthawks; it had become an icon. It is easy to understand its appeal. This is not just an image of big-city loneliness, but of existential loneliness: the sense that we have (perhaps overwhelmingly in late adolescence) of being on our own in the human condition. When we look at that dark New York street, we would expect the fluorescent-lit cafe to be welcoming, but it is not. There is no way to enter it, no door. The extreme brightness means that the people inside are held, exposed and vulnerable. They hunch their shoulders defensively. Hopper did not actually observe them, because he used himself as a model for both the seated men, as if he perceived men in this situation as clones. He modeled the woman, as he did all of his female characters, on his wife Jo. He was a difficult man, and Jo was far more emotionally involved with him than he with her; one of her methods of keeping him with her was to insist that only she would be his model."