After midnight, as America's cities gradually fall asleep, Axel Hütte comes alive. From the window of his hotel room on the upper floors of high-rises, he surveys the nighttime cityscapes of Chicago, Las Vegas, Atlanta, New York, Los Angeles, and Houston: the black silhouettes of buildings in front of a dark sky, rows of street lights, dots of color from neon signs, here and there a bright window. Big cities never sleep, there is no such thing as utter darkness, and stars only rarely have a chance to gain the upper hand against neon and nightlife.